MANCHESTER, England — Children were among the 22 people killed in a suicide attack after an Ariana Grande concert at Britain's Manchester Arena, police confirmed Tuesday. 
 
 Meanwhile, authorities identified the suicide bomber responsible for the carnage as 22-year-old Salman Abedi and warned angry residents against any reprisals. 
 
 "We understand that feelings are very raw right now and people are looking for answers," Manchester Police Chief Constable Ian Hopkins said. "We will not tolerate hate towards any parts of our community." 
 
 Police also arrested a 23-year-old man in Manchester in connection with the attack. 
 
 Abedi had a British passport, sources told NBC News, but it was not immediately clear where he was born. He was killed when he detonated an improvised explosive device near one of the venue's exits at 10:33 p.m. local time Monday, officials said. 
 
 The pop star's fan base is primarily girls and teenagers, so the venue was packed full of families. 
 
 While Hopkins did not identify any of the dead, 8-year-old Saffie Rose Roussos' death was confirmed by her school. 
 
 Some 59 other people were wounded, including some who suffered life-threatening injuries, officials said. 
 
 And thousands of grieving Manchester residents were expected to attend a vigil at 6 p.m. local time Tuesday to remember the victims. 
 
 ISIS claimed responsibility for the attack but provided no evidence and neither U.S. nor British officials have corroborated that. 
 
 The blast sparked a nightlong search for loved ones as frantic parents tried to locate their children, and groups of friends scattered by the explosion sought each other. 
 
 Play Facebook 
 
 Twitter 
 
 Embed Moment Blast Shook Manchester Arena Caught on Camera 0:33 autoplay autoplay Copy this code to your website or blog 
 
 Video shot inside the 21,000-capacity venue showed terrified teenagers screaming as they made their way out amid a sea of pink balloons. Some fans were still wearing the singer and former Nickelodeon TV actress' trademark kitten ears as they fled. 
 
 "We have been treating this as a terrorist incident," Greater Manchester Police Chief Constable Ian Hopkins told reporters. "Our priority is to establish whether he was acting alone or as part of a network." 
 
 Rohit Kachroo, security editor for NBC News' U.K. partner ITV News, reported that nuts and bolts were spotted in the arena's foyer but police would not comment on whether victims had suffered wounds from shrapnel. 
 
 “ When it exploded, it just rocked your whole body” 
 
 Police said the explosion took place outside the arena catching people as they exited, also triggering chaos inside the venue. U.S. officials said initial reports indicated that some of the injuries might have been caused by a stampede of concertgoers. 
 
 Nicola Murray, who was at the concert with her 12-year-old daughter Olivia, told NBC News that she witnessed "a red-orange-looking flash" and heard an "incredibly loud bang." 
 
 "Within seconds, as you can imagine, it was chaos and people were panicking and running to try and get out the door," she said. "We were getting swept with the people crushing to get out and I was terrified my daughter would get crushed. At one point, she was getting dragged away from me but I managed to pull her into me and force her in front of me while trying to direct her to the door and down the steps.” 
 
 Murray, who had traveled to the concert from the Scottish town of Hamilton, said the area outside the venue was "full of people who were completely traumatized — kids and adults alike all crying, screaming, some still running away ... adults in cars who were due to be picking up kids screaming trying to find them." 
 
 The scene after a suicide bombing in the foyer of the Manchester Arena on Monday. PA Wire/PA Images 
 
 Alison Pritchard, 34, who works as a waitress, recalled hearing "an almighty explosion behind us." 
 
 Her friend Carole Taylor, a 49-year-old teacher, told NBC News she turned around to see "this plume of smoke coming over and all this sort of debris and embers floating from the roof." 
 
 "When it exploded, it just rocked your whole body," she said. "It went right through us. People started screaming." 
 
 Related: A 'Very Horrified City' Embraces Kindness After Concert Attack 
 
 Steve Rotheram, the mayor of Liverpool, told NBC News his two daughters and two nieces were at the show. They described "pandemonium" at the scene with "people climbing over seats to get to exits [and] obviously there were a lot of young girls so there was a lot of screaming and panic," he said. 
 
 However, Rotheram's four relatives managed to escape safely. 
 
 Hopkins, the police chief, confirmed that children were among the dead and warned of "difficult days ahead." 
 
 Play Facebook 
 
 Twitter 
 
 Embed Witnesses Describe Fear After Manchester Explosion 1:14 autoplay autoplay Copy this code to your website or blog 
 
 British Prime Minister Theresa May said the terrorist set out "to cause maximum carnage and kill and injure indiscriminately." 
 
 She added: "This attacks stands out for its appalling, sickening cowardice — deliberately targeting innocent and defenseless young people who should have been enjoying one of the most memorable nights of their lives.” 
 
 Related: Rock Legend's Daughter 'Safe' After Concert Carnage 
 
 Police said emergency services received 240 calls after the incident and victims were taken to eight hospitals. At least a dozen people aged under 16 were hospitalized. 
 
 Jon Rouse, a local health official, said the wounded included "a number of individuals who have very, very serious injuries ... and people who are going to be in hospital for a long time." 
 
 Ariana Grande performs at Madison Square Garden in New York on Feb. 23. Kevin Mazur / Getty Images for Republic Record 
 
 Grande, 23, tweeted early Tuesday: "broken. from the bottom of my heart, i am so so sorry. i don't have words." 
 
 In a statement, the pop star's manager Scooter Braun thanked first responders "who rushed towards danger to help save lives." 
 
 He added: "We ask all of you to hold the victims, their families and all those affected in your hearts and prayers." 
 
 Bianca Landrau, the Boston hip-hop star known as Bia, who also performed, tweeted: "Guys we are okay!!!" 
 
 And singer Victoria Monét, the opening act, said in a statement that she was safe but "heartbroken that loved ones who came to have the night of their lives ended up losing them." 
 
 "I wish I could say that I am OK, but I am not," she wrote, adding: "Please send all your prayers up high for Manchester." 
 
 Play Facebook 
 
 Twitter 
 
 Embed Manchester bombing witness: 'It sounded like a gunshot' 3:58 autoplay autoplay Copy this code to your website or blog 
 
 Britain's terrorist threat level stands at "severe," the second-highest rung on a five-point scale, meaning an attack is highly likely. 
 
 White House Press Secretary Sean Spicer said President Donald Trump's national security team was keeping him up to date while he is in Israel. 
 
 Speaking after meeting with Palestinian leader Mahmoud Abbas in Bethlehem on Tuesday, Trump blamed "evil losers" for the attack, adding that he won't call terrorists "monsters" as "they'd think that's a great name." 
 
 He added: "We cannot stand for a moment longer for the slaughter of innocent people." 
 
 The Department of Homeland Security stressed that there was no information to indicate a specific credible threat involving U.S. music venues. 
 
 Play Facebook 
 
 Twitter 
 
 Embed In wake of Manchester bombing, are you safe at concerts? 2:58 autoplay autoplay Copy this code to your website or blog 
 
 Manchester Arena, which opened in 1995, is one of the largest indoor venues in Europe. More than 1 million people fill its seats every year. It is located near the Manchester Victoria transit station. 
 
 Local families offered beds for the night to people who had been affected by the explosion, and taxis provided free rides. 
 
 Before you speculate about those Muslims again, Muslim cabbies and taxi drivers giving free lifts to get ppl safe #Manchester — A.Wajid (@w47id) May 22, 2017 
 
 Manchester Muslim doctors working through the night, Manchester Muslim taxi drivers taking people home for free. You don't know Manchester. https://t.co/C8yXe7u0jw — Glenn Kitson (@Glenn_Kitson) May 23, 2017 
 
 A statement issued by Muslim organizations in the Manchester area said the community was “saddened and horrified" by the attack. 
 
 It added: “The perpetrators, whoever they may be, must bear the full consequences of their actions.” 
 
 This was Britain's deadliest terrorist attack since four suicide bombers killed 52 London commuters on three subway trains and a bus in July 2005. 
 
 Manchester is located 160 miles northwest of London. It was hit by a huge Irish Republican Army bomb in 1996 that leveled a swath of the city center. More than 200 people were injured in that attack, though no one was killed. 
 
 Came down to the postbox which was the last thing standing after the IRA bomb in 96.Manchester cordoned off again for the city's darkest day pic.twitter.com/YToPZtnghv — Will Perry (@willperryTV) May 23, 2017 
 
 Alexander Smith reported from Manchester. Eoghan Macguire and Jason Cumming reported from London. Alex Johnson reported from Los Angeles. ||||| The video will start in 8 Cancel 
 
 Get daily updates directly to your inbox Subscribe Thank you for subscribing We have more newsletters Show me See our privacy notice Could not subscribe, try again later Invalid Email 
 
 Family and friends of people missing following last night’s terror attack in Manchester have been sharing their details in a bid to find their loved ones. 
 
 The family of 50-year-old Wendy Fawell, from Leeds, are also praying for good news. 
 
 She was waiting outside the arena after dropping off her daughter, daughter's boyfriend and his brother. 
 
 She's not been seen since the attack and her phone is ringing out. 
 
 Music lovers Chloe Rutherford, 17, and Liam Curry, 19, from South Shields, are among those who haven’t been in contact with family members since the blast at Manchester Arena. 
 
 Dawn Finnigan posted on twitter: “Thank you everyone for the retweets. There is still no news on Chloe and Liam. The family have been in touch with @gmpolice #manchester.” 
 
 Two Scots teenagers are missing in the aftermath of the attack. 
 
 The families of Laura MacIntyre and Eilidh MacLeod pleaded with the pair to get in touch after they travelled from the Isle of Barra to go to the Ariana Grande concert. 
 
 One of the girls' aunts confirmed the pair had not contacted relatives since the blast. However, Sky News have reported that Laura's family had been found, and is seriously injured in hospital. 
 
 Margaret MacNeil said: "Please please please share! My niece and her friend were at the Ariana Grande concert tonight and there has been no contact since the explosion. Please let us find the girls safe and well. They are Eilidh MacLeod and Laura MacIntyre." 
 
 Deborah Hutchinson is appealing for information about her daughter and partner who were both at the gig. 
 
 Sharing a photo of the pair on Facebook, Deborah, from Newcastle, said: “My daughter Courtney Boyle and partner Philip Tron have gone missing in a attack at Manchester tonight please share and help find them I need them home safe xX.” 
 
 Video Loading Video Unavailable Click to play Tap to play The video will start in 8 Cancel Play now 
 
 At least 22 people have been killed and 59 injured in the devastating suicide bomb terror attack. 
 
 The blast ripped through the foyer as thousands of young concert goers streamed out of a gig by US singer Ariana Grande. ||||| MANCHESTER, England (Reuters) - British police on Tuesday identified the suicide bomber who killed 22 people, including children, in an attack on a crowded concert hall in Manchester, and said they were trying to establish whether he had acted alone or with help from others. 
 
 The man suspected of carrying out Britain's deadliest bombing in nearly 12 years was named as Salman Abedi, aged 22, but police declined to give further details about him. (For a graphic showing where the blast hit: tmsnrt.rs/2rKy5Y1) 
 
 U.S. security sources, citing British intelligence officials, said he was born in Manchester in 1994 to parents of Libyan origin. He is believed to have traveled by train from London before the attack, they said. 
 
 “Our priority, along with the police counter-terrorism network and our security partners, is to continue to establish whether he was acting alone or working as part of a wider network,” Manchester Police Chief Constable Ian Hopkins said. 
 
 The attacker set off his improvised bomb as crowds streamed out of the Manchester Arena after a pop concert by Ariana Grande, a U.S. singer especially popular with teenage girls. 
 
 “All acts of terrorism are cowardly,” Prime Minister Theresa May said outside her Downing Street office after a meeting with security and intelligence chiefs. 
 
 “But this attack stands out for its appalling sickening cowardice, deliberately targeting innocent, defenseless children and young people who should have been enjoying one of the most memorable nights of their lives.” 
 
 Britain has increased its security threat level to “critical” from “severe” following the attack, May said in a later televised statement, adding that members of the armed forces would boost security at key sites and military personnel might be deployed at public events such as concerts and sports events. 
 
 Islamic State, now being driven from territories in Syria and Iraq by Western-backed armed forces, claimed responsibility for what it called a revenge attack against “Crusaders”, but there appeared to be contradictions in its account of the operation. 
 
 FRANTIC SEARCHES 
 
 Witnesses related the horror of the blast, which unleashed a stampede just as the concert ended at Europe’s largest indoor arena, full to its capacity of 21,000. 
 
 “We ran and people were screaming around us and pushing on the stairs to go outside and people were falling down, girls were crying, and we saw these women being treated by paramedics having open wounds on their legs ... it was just chaos,” said Sebastian Diaz, 19. “It was literally just a minute after it ended, the lights came on and the bomb went off.” 
 
 A video posted on Twitter showed fans, many of them young, screaming and running from the venue. Dozens of parents frantically searched for their children, posting photos and pleading for information on social media. 
 
 Singer Grande, 23, said on Twitter she was devastated: “broken. from the bottom of my heart, i am so so sorry. i don’t have words.” 
 
 The attack was the deadliest in the UK since four British Muslims killed 52 people in suicide bombings on London’s transport system in 2005. But it will have reverberations far beyond British shores. 
 
 Attacks in cities including Paris, Nice, Brussels, St Petersburg, Berlin and London have shocked Europeans already anxious over security challenges from mass immigration and pockets of domestic Islamist radicalism. Islamic State has repeatedly called for attacks as retaliation for Western involvement in the conflicts in Syria and Iraq. 
 
 While claiming responsibility on its Telegram account, the group appeared to contradict the police description of a suicide bomber. It suggested explosive devices were placed “in the midst of the gatherings of the Crusaders”. 
 
 “What comes next will be more severe on the worshippers of the cross,” the Telegram posting said. 
 
 It did not name the bomber, as it usually does in attacks it has ordered, and appeared also to contradict a posting on another Islamic State account, Amaq, which spoke of “a group of attackers”. That reference, however, was later removed. 
 
 People take part in a vigil for the victims of an attack on concert goers at Manchester Arena, in central Manchester, Britain May 23, 2017. REUTERS/Peter Nicholls 
 
 “DEPRAVED” 
 
 May said security services were working to see if a wider group was involved in the attack, which fell less than three weeks before a national election. Campaigning was suspended as a mark of respect. 
 
 May spoke to U.S. President Donald Trump, French President Emmanuel Macron and several other foreign leaders on Tuesday about the attack, her spokesman said. She also visited the police headquarters and a children’s hospital in Manchester. 
 
 The White House said Trump had agreed with May during their telephone conversation that the attack was “particularly wanton and depraved”. 
 
 Macron and senior French ministers walked to the British embassy in Paris to sign the condolence book. 
 
 German Chancellor Angela Merkel said it “will only strengthen our resolve to...work with our British friends against those who plan and carry out such inhumane deeds”. 
 
 The U.N. Security Council condemned “the barbaric and cowardly terrorist attack” and expressed solidarity with Britain in the fight against terrorism. 
 
 Queen Elizabeth held a minute’s silence at a garden party at Buckingham Palace in London. 
 
 Manchester remained on high alert, with additional armed police drafted in. London Mayor Sadiq Khan said more police had been ordered onto the streets of the British capital. 
 
 Police raided a property in the Manchester district of Fallowfield where they carried out a controlled explosion. 
 
 On Tuesday evening thousands of people attended a vigil in central Manchester in somber but defiant mood. 
 
 “There’s hard times again in these streets of our city, but we won’t take defeat and we don’t want your pity, because this is the place where we stand strong together with a smile on our face, Mancunians forever,” local poet Tony Walsh said in a poem he read to the crowd that drew loud cheers and applause. 
 
 Slideshow (24 Images) 
 
 British police do not routinely carry firearms, but London police said extra armed officers would be deployed at this weekend’s soccer cup final at Wembley and rugby at Twickenham. Security would be reviewed also for smaller events. 
 
 In March, a British-born convert to Islam plowed a car into pedestrians on London’s Westminster Bridge, killing four people before stabbing to death a police officer who was on the grounds of parliament. The man was shot dead at the scene. 
 
 In 2015, Pakistani student Abid Naseer was convicted in a U.S. court of conspiring with al Qaeda to blow up the Arndale shopping center in the center of Manchester in April 2009. ||||| The deadly attack carried out by a suspected suicide bomber in Manchester, England, on Monday night left emergency personnel scrambling to secure the area, tend to the wounded and reunite lost children with their families. 
 
 Interested in Manchester? Add Manchester as an interest to stay up to date on the latest Manchester news, video, and analysis from ABC News. Add Interest 
 
 Here's a timeline of events for the attack: 
 
 10:35 p.m. local time Monday: Emergency services received more than 240 calls to the Manchester Arena, which seats 21,000 people. 
 
 Concertgoers reported hearing a loud bang at the end of the concert just as Grande left the stage. Thousands of attendees rushed toward the exit. 
 
 Photos from the scene show wounded victims on the floor in the venue or being carried out by others. 
 
 Locals in Manchester begin opening up their homes with the hashtag #RoomforManchester. 
 
 Police say the explosion is being treated as a terrorist incident. 
 
 1:30 a.m.: Police conduct a controlled explosion in Cathedral Gardens, a few minutes from the stadium. They later confirm that what was thought to be a suspicious item was abandoned clothing. 
 
 4:06 a.m.: The North West Ambulance Service announces that more than 60 ambulances responded to the scene. 
 
 11:54 a.m.: Police confirm that a man was been arrested at the Arndale Center but say the arrestee is not believed to be connected to the attacks. 
 
 3:51 a.m.: Ariana Grande tweets that she is "broken" and "so sorry" in response to the attack. 
 
 broken. 
 
 from the bottom of my heart, i am so so sorry. i don't have words. — Ariana Grande (@ArianaGrande) May 23, 2017 
 
 What we know about the attack 
 
 Twenty-two dead, 59 wounded 
 
 Children are among the dead, including an 8-year-old girl 
 
 The attack was claimed by ISIS 
 
 The suspected attacker has been identified as 22-year-old Salman Abedi by police 
 
 U.K. Prime Minister Theresa May called the attack "sickening" 
 
 The wounded and the missing 
 
 The wounded are being treated in several different area hospitals and some of them are battling life-threatening injuries, authorities said. 
 
 Many people are still missing and an emergency hotline has been set up for people concerned for “loved ones who may not have returned home," police said. Facebook activated its global "safety check" feature in the wake of the deadly attack. 
 
 The investigation 
 
 Police have said they believe the attack was carried out by “one man,” 22-year-old Salman Abedi, who died at the scene after he detonated an "improvised explosive device.” Police and intelligence officials immediately launched an investigation after Monday's incident. 
 
 On Tuesday, Manchester police also announced the arrest of a 23-year-old suspect in connection with the attack. 
 
 So far, they have not said if there were any accomplices in planning or carrying out the attack or if any suspects have been linked to terrorist organizations. 
 
 The terror group ISIS claimed responsibility for the attack on Tuesday in an Arabic-language news release. 
 
 “The priority is to establish whether he was acting alone or as part of a network,” Ian Hopkins, chief constable of Greater Manchester Police, said of the attacker at a press conference Tuesday. 
 
 “Our priority is to work with the national counterterrorism policing network to establish more details about the individual who carried out this attack," he added. 
 
 Police have not identified the nationality of the person behind the attack, but a former director of the security service M16 told BBC earlier that the bomber was likely already known to security services. 
 
 Prime Minister calls the attack "sickening" after an emergency meeting on Tuesday 
 
 U.K. Prime Minister Theresa May called the suspected terrorist attack "sickening" and "appalling." She held an emergency meeting with government ministers, military and security chiefs to plan the government’s overall response. 
 
 The prime minister announced Tuesday evening that the country's threat level had increased to critical, meaning another attack is imminent. 
 
 May said the attacker deliberately targeted children and young people "who should have been enjoying one of the most memorable nights of their lives." 
 
 "We struggle to comprehend the warped and twisted mind that sees a room packed with young children not as a scene to cherished but as an opportunity for carnage," May said. 
 
 The concert venue, which holds about 21,000 people, is one of Europe’s largest indoor arenas, according to its website, and it is connected to the city’s second-largest train station. 
 
 Ariana Grande's tour 
 
 It’s not clear if Grande, who has two concerts scheduled in London later this week, will go on with her world tour as planned. 
 
 The pop star‘s "Dangerous Woman" tour was originally scheduled to end on Sept. 21 in Hong Kong. 
 
 Grande was not hurt in the attack, but she tweeted last night that she was feeling “broken.” 
 
 broken. 
 
 from the bottom of my heart, i am so so sorry. i don't have words. — Ariana Grande (@ArianaGrande) May 23, 2017 
 
 ABC News' Emily Shapiro contributed to this report. ||||| Breaking News Emails Get breaking news alerts and special reports. The news and stories that matter, delivered weekday mornings. 
 
 The first victims identified in the suicide bombing after an Ariana Grande concert in Britain were an 8-year-old remembered as a "beautiful little girl," an 18-year-old college student who had previously met her pop idol and a 26-year-old competitive dancer who was mourned as a "true gentleman" and "one in a million." 
 
 Other victims were identified later Tuesday (early Wednesday local time) as a 15-year-old whose mother described her as "my darling precious gorgeous girl" and a 22-year-old who wrote excitedly about getting to attend the American pop star's concert. 
 
 It was also confirmed Wednesday that an off-duty Cheshire police officer was among the dead. She was not named. 
 
 They were among the 22 people who were killed Monday night at Manchester Arena in the deadliest terror attack in Britain since 2005. Another 59 people were also injured as the suspect detonated a bomb near one of the venue's exits, sending the mostly younger concertgoers fleeing in panic, authorities said. 
 
 Grande's fans are predominantly teens and young girls, and many had gone to the venue with their parents for a night of carefree fun that in a flash turned into a scene of carnage. Hours after the bloodshed, desperate parents said they were still trying unsuccessfully to reconnect with children. 
 
 The victims have been confirmed so far as: 
 
 Saffie Rose Roussos, 8 
 
 Saffie Rose Roussos PA via AP 
 
 Saffie was a student at the Tarleton Community Primary School, located northwest of Manchester. Local officials in a written statement provided to NBC News said the community was reeling after learning such a young and innocent life was lost. 
 
 "News of Saffie's death in this appalling attack has come as a tremendous shock to all of us and I would like to send our deepest condolences to all of her family and friends," said Chris Upton, the head teacher at Tarleton Community. "The thought that anyone could go out to a concert and not come home is heartbreaking." 
 
 He added that Saffie "was simply a beautiful little girl in every aspect of the word. She was loved by everyone and her warmth and kindness will be remembered fondly." 
 
 Georgina Callander, 18 
 
 Callander was studying health and social care in her second year at Runshaw College in Lancashire, the school said. She was remembered for her outgoing personality. 
 
 "Our deepest sympathies, thoughts and prayers go out to all of Georgina's friends, family, and all of those affected by this loss," the college posted on Facebook. 
 
 Her former school, Bishop Rawstorne Church of England Academy, called Callander "a lovely young student who was very popular with her peers and the staff and always made the most of the opportunities she had at the school." 
 
 Georgina Callander poses with Ariana Grande in a photo posted to her Instagram account in 2015. via Instagram 
 
 On social media, Callander was enamored by television and movie stars, Disney films, "Harry Potter" and pop singers — Grande was among her favorites. 
 
 Two years ago, she got to meet Grande while attending her "The Honeymoon Tour" at the Manchester Arena. She shared photos on Instagram and gushed over how nice Grande was to her. 
 
 "I HUGGED HER SO TIGHT AND SHE SAID SHE LOVED MY BOW I CANT GET OVER THIS I NEVER WILL," Callander captioned her picture. 
 
 "Once Upon a Time" actress Karen David had met Callander just two weeks ago at a fan convention and shared her memory of the teen on Instagram. 
 
 "It makes me so angry and it breaks my heart that such a young and promising life has been stolen away!" David wrote, adding, "Dearest Georgina, may your kind soul rest in peace. Heaven has gained an angel." 
 
 A GoFundMe page has met its goal of raising money for Callander's family, and its organizer, Luke Cutforth, told NBC News that "the response today ... has truly shown what an incredible capacity for kindness humanity has in the face of those few who stray." 
 
 John Atkinson, 26 
 
 Little information was immediately available about Atkinson, whose sister asked friends not to cooperate with reporters. Atkinson, who lived in the Manchester area, enrolled in Bury College in 2015, studying health, according to his memorial page on Facebook. 
 
 Freak Dance, a dance studio in nearby Radcliffe, said on Facebook that Atkinson took adult dance classes "and even competed for Freak Dance." 
 
 "He was a true friend, not just to our staff but many of the parents and students from the school," the studio said. 
 
 On a GoFundMe page posted to raise money for his family, a friend said: "John was one one in a million and loved by so many!! A true gentleman." 
 
 Olivia Campbell, 15 
 
 Olivia Campbell, in an undated family photo. Courtesy Campbell Family 
 
 Campbell's mother said in a Facebook post Tuesday that Olivia was among the those killed in the bombing. 
 
 "RIP my darling precious gorgeous girl Olivia Campbell taken far far [too] soon go sing with the angels and keep smiling mummy loves you so much," Charlotte Campbell wrote. 
 
 Related: Mom Mourns Teen Killed in Manchester Arena Suicide Bombing 
 
 Olivia’s social media profile identifies her as a resident of Bury, a town north of Manchester. It describes her interests as "music is my everything." 
 
 Earlier Tuesday, Charlotte Campbell told NBC’s British partner ITV News that her daughter had gone to the concert with a friend, and the friend had been located at a hospital but Olivia was still missing. Calls to her phone went unanswered, the heartbroken mother said Tuesday morning. 
 
 Martyn Hett, 29 
 
 Hett was a journalist who wrote for a variety of publications, including the Manchester Evening News, HuffPost and Attitude Magazine. He was also an LGBTQ activist, according to BuzzFeed, with a substantial Twitter following. 
 
 Twice Hett had sent out tweets that went viral. In 2016, his pleas to his Twitter followers to buy his mother's knitted creations led to her collection being sold out. Hett's mother later donated some of her earnings from the viral moment to Beacon Counselling, BuzzFeed reported. 
 
 Martyn Hett, 29, was killed in the Manchester attack outside an Ariana Grande concert. via Facebook 
 
 Hett also created a stir in 2015 after he got a full-color portrait of actress Anne Kirkbride, who played Deirdre Barlow on the British soap opera "Coronation Street," tattooed on his calf. 
 
 Local papers had noted that he and boyfriend Russell Hayward were superfans of "Coronation Street" — sometimes shortened to "Corrie." 
 
 After learning of Hett's death, Hayward wrote on Twitter: "Soulmate doesn't even come close. Come back to us Martyn so we can watch last nights Corrie together." 
 
 After news of his death broke, Hett's name began trending on Twitter in the U.K. 
 
 "He would, I think it's safe to say, be f------ loving this," Dan Hett, who said he was Martyn Hett's brother, wrote in a tweet with an image of the list of trending items. 
 
 Hayward tweeted on Wednesday that Hett died in the explosion after the concert, and later confirmed his death to NBC News but declined to comment further. Hett's Facebook page has since been turned into a "remembering" page. 
 
 "We got the news last night that our wonderful iconic and beautiful Martyn didn't survive," Hayward wrote on Twitter. "He left this world exactly how he lived, centre of attention." 
 
 Hayward went on to express his heartbreak over losing Hett, and thanked his family and friends for their support before writing that he loved Hett and "always will." 
 
 Hett's Twitter page had several tweets saying how excited he was to be going to Grande's concert on Monday night, and his love for her music. More than 400 people replied to his final tweet about being there. 
 
 Nell Jones, 14 
 
 Nell Jones, who lost her life in the Manchester bombing on May 22, 2017. via Facebook 
 
 Friends of Jones, who was described as "very bright and popular," said her death was like losing a sister. 
 
 Her school, Holmes Chapel Comprehensive School and Sixth Form College, first confirmed "with great sadness" that the 14-year-old had died in the attack. 
 
 The teen's family had been searching for her in the aftermath, but police confirmed to them that she died at the scene. 
 
 "Nell was a very popular girl, always smiling, always positive," her tutor, David Wheeler, said in the statement. "Her tutor group have been together since the transition from primary school. It feels like they have lost a sister not a classmate." 
 
 School officials said they met with Jones' parents to offer their condolences. ||||| Image copyright New York Times Image caption The New York Times says this evidence was gathered at the scene of the attack 
 
 Police investigating the Manchester Arena bomb attack have stopped sharing information with the US after leaks to the media. 
 
 UK officials were outraged when photos appearing to show debris from the attack appeared in the New York Times. 
 
 It came after the name of bomber Salman Abedi was leaked to US media just hours after the attack, which left 22 dead. 
 
 Theresa May said she would tell Donald Trump at a Nato meeting that shared intelligence "must remain secure". 
 
 The US's acting ambassador to the UK "unequivocally condemned" the leaks in a BBC radio interview. 
 
 "These leaks were reprehensible, deeply distressing," Lewis Lukens said. 
 
 "We have had communications at the highest level of our government ... we are determined to identify these leaks and to stop them." 
 
 Meanwhile, the Queen has been to the Royal Manchester Children's Hospital visiting some of the injured as well as members of the emergency services. 
 
 While there she paid tribute to Manchester and the "extraordinary" way the city had responded to Monday's attack at an Ariana Grande concert, in which 116 people were also injured. 
 
 Families' distress 
 
 In total eight men are now in custody following the bombing carried out by Manchester-born Abedi, a 22-year-old from a family of Libyan origin. 
 
 The arrests have been "significant" while searches of premises have also yielded items "important to the investigation", Greater Manchester Police said. 
 
 It has also emerged two people who had known Abedi at college made separate calls to a hotline to warn the police about his extremist views. 
 
 A Whitehall source said Abedi was one of a "pool" of former subjects of interest whose risk remained "subject to review" by the security service and its partners. 
 
 In other developments: 
 
 Greater Manchester Police hope to resume normal intelligence relationships - a two-way flow of information - soon but is currently "furious", the BBC understands. 
 
 Its chief constable Ian Hopkins said the recent leak had caused "much distress for families that are already suffering terribly with their loss.". 
 
 The force - which is leading the investigation on the ground - gives its information to National Counter-Terrorism, which then shares it across government and - because of the Five Eyes intelligence sharing agreement - with the US, Australia, Canada and New Zealand. 
 
 Media playback is unsupported on your device Media caption Manchester attack: Queen visits Royal Manchester Children's Hospital 
 
 All other US-UK intelligence is still being shared, while five terrorist plots have been disrupted in the UK since the 22 March Westminster attack, the BBC has learned. 
 
 Home Secretary Amber Rudd has said she is "confident" the leaks will now end, after having voiced her irritation following the leak of the attacker's name. 
 
 However, the pictures of debris - which appear to show bloodstained fragments from the bomb and the backpack used to conceal it - were subsequently leaked to the New York Times, prompting an angry response from within Whitehall and from UK police chiefs. 
 
 BBC security correspondent Gordon Corera says UK officials believe that US law enforcement rather than the White House is the likely culprit for the leaks. 
 
 Analysis 
 
 By Dominic Casciani, BBC home affairs correspondent 
 
 The police decision to stop sharing information specifically about the Manchester attack with their security counterparts in the US is a hugely significant move and shows how angry British authorities are. 
 
 The information from the crime scene wasn't shared on a whim: the British and Americans have a lot of shared world-leading expertise in improvised explosive devices and scientists would be discussing whether the Manchester device tells them something new that could, ultimately, track down a bomb-maker. 
 
 Other sharing will continue. The UK and US share a vast amount of information about terror and espionage threats - it is a tight-knit network that also encompasses Canada, Australia and New Zealand. 
 
 That system is based on trust and the "control principle": if a piece of intelligence is shared, the receiving nation has no right to further disseminate it without permission. 
 
 The UK's National Police Chiefs' Council described the "unauthorised disclosure" as a breach of trust which had potentially undermined a "major counter-terrorism investigation". 
 
 Counter-terrorism detectives have spoken in the past about how a delay of about 36 hours before the public know who is being investigated can allow known associates of the suspect to be arrested without being tipped off. 
 
 Lord Blair, who was the head of the Metropolitan Police at the time of the bombings in London on 7 July 2005, said a similar leak had happened then. 
 
 "It's a different world in which the US operate in terms of how they publish things and this is a very grievous breach but I'm afraid it's the same as before," he said. 
 
 Image caption Abedi's father, Ramadan, was held in Tripoli 
 
 What's happening with the investigation? 
 
 Eight men have been arrested in the UK since Monday night, including Abedi's older brother Ismail, 23. 
 
 Abedi's younger brother Hashem, 20, was held by special forces linked to the interior ministry in the Libyan capital Tripoli, as was their father. 
 
 Speaking on Wednesday, Greater Manchester Chief Constable Ian Hopkins said: "It's very clear that this is a network that we are investigating." 
 
 As part of their investigation, raids involving controlled explosions have been carried out at a block of flats near Manchester Piccadilly station in the city centre on Wednesday and at an address in the Moss Side area of Manchester in the early hours of Thursday. 
 
 Anyone with information can call the anti-terror hotline on 0800 789321. 
 
 Who are the victims? 
 
 Image caption From left: Courtney Boyle, Elaine McIver and Eilidh MacLeod 
 
 Abedi detonated his "nuts-and-bolts" bomb at the end of an Ariana Grande gig as children, teenagers and others were making their way out of Manchester Arena. 
 
 Others, including parents, were waiting in the foyer to pick up family and friends when the bomb went off. 
 
 The youngest so far known to have died is eight-year-old Saffie Roussos. Off-duty Cheshire police officer Elaine McIver was also among the dead. 
 
 The latest victims to be named are Wendy Fawell, 50, from Otley, west Yorkshire and Eilidh MacLeod, a 14-year-old from Barra in the Outer Hebrides, and 19-year-old Courtney Boyle. 
 
 Of the 116 injured, 75 remain in hospital. Of those 23 are in critical care, five of them children. 
 
 Who was the attacker? 
 
 Image caption Salman Abedi was described by a former classmate as short-tempered and gullible 
 
 Salman Abedi was a 22-year-old born in Manchester to Libyan parents, and a former University of Salford student. 
 
 He attended Burnage Academy for Boys in Manchester between 2009 and 2011, and The Manchester College until 2013. 
 
 A former classmate told the BBC that Abedi was a "very jokey lad" but also "very short tempered" and would get angry at "the littlest thing". 
 
 The man, who did not want to be identified, said Abedi had hung around "the wrong crowd and was very, very gullible". 
 
 Before leaving Burnage Academy, Abedi had become "more and more religious", the man added. 
 
 A Muslim community worker, who did not want to be identified, has told the BBC that two people who had known Abedi at college had made separate calls five years ago to a hotline to warn about his extremist views. 
 
 He said they had been worried that Abedi was "supporting terrorism" and he had expressed the view that "being a suicide bomber was ok". 
 
 Profile: Who was Salman Abedi? ||||| Media playback is unsupported on your device Media caption The sixth person to be held in the UK following Monday's deadly attack, was arrested in Wigan 
 
 A seventh person has been arrested in the UK over the Manchester Arena bombing, as police said they were investigating a "network". 
 
 Police said they arrested the man in Nuneaton, Warwickshire, following searches. 
 
 Suicide bomber Salman Abedi killed 22 - including children - and injured 64 at an Ariana Grande concert on Monday. 
 
 The bomber's father, Ramadan, and younger brother, Hashem, have been detained by militia in Libya. 
 
 His older brother, Ismail, was detained in Chorlton, south Manchester, on Tuesday. 
 
 Image caption Hashem Abedi, the bomber's 20-year-old brother, was detained in Tripoli 
 
 The fifth UK arrest on Wednesday - in Wigan - involved a man who was carrying a package that is now being "assessed", police said. 
 
 Eyewitness Connor Britton told the BBC the man had been held by "undercover armed police". 
 
 He said workers in his office had been told to stay inside and lock their windows, and that a red package had been "moved to a clear part of the street". 
 
 The UK terror threat level is now at its highest level of "critical", meaning more attacks may be imminent. 
 
 Military personnel are being deployed to protect key sites after the UK's terror threat level was raised on Tuesday night. 
 
 Home Secretary Amber Rudd said: "[Monday's attack] was more sophisticated than some of the attacks we've seen before, and it seems likely - possible - that [Abedi] wasn't doing this on his own." 
 
 Image copyright New York Times Image caption The New York Times says this evidence was gathered at the scene of the attack 
 
 Meanwhile, the New York Times has obtained photos which it says were gathered by UK authorities at the scene of the attack, including the remnants of a backpack, nuts and screws, and a device identified as a "possible detonator". 
 
 The paper says the alleged evidence suggests "a powerful, high-velocity charge, and a bomb in which its shrapnel was carefully and evenly packed". 
 
 UK authorities have reacted with anger to the publication of the leaked pictures. 
 
 One Whitehall source told the BBC there was "disbelief and astonishment" across Whitehall. 
 
 A counter terrorism policing spokesperson said it was a breach of trust that undermined relationships with "trusted intelligence, law enforcement and security partners around the world" and undermined the confidence of victims, witnesses and their families. 
 
 "This damage is even greater when it involves unauthorised disclosure of potential evidence in the middle of a major counter terrorism investigation," the spokesperson added. 
 
 BBC security correspondent Frank Gardner said that the bomber is thought to have been a "mule", using a device built by someone else. 
 
 In other developments: 
 
 Ariana Grande has cancelled forthcoming concerts in London, Belgium, Poland and Germany, saying she wanted to "pay proper respect to those lost" 
 
 A minute's silence will be held at 11:00 BST on Thursday in remembrance of those who lost their lives or were affected by the attack, the government has announced 
 
 The Conservatives and Labour will resume local general election campaigning on Thursday, and national campaigning on Friday 
 
 A silence will be held before the FA Cup final between Arsenal and Chelsea on Saturday, with a wreath laid by FA president Prince William 
 
 What's happening with the investigation? 
 
 Image caption Abedi's father Ramadan was held in Tripoli 
 
 Seven people were arrested in the UK since Monday night, including Abedi's older brother Ismail, 23. He has since been released without charge. 
 
 Younger brother Hashem, 20, was held by militia in the Libyan capital Tripoli, as was their father. 
 
 Speaking on Wednesday afternoon, Greater Manchester Chief Constable Ian Hopkins said: "I think it's very clear that this is a network that we are investigating. 
 
 "And as I've said, it continues at a pace. There's extensive investigations going on and activity taking place across Greater Manchester, as we speak." 
 
 As part of their investigation, police raided a block of flats near Manchester Piccadilly station in the city centre, requiring them to carry out a controlled explosion and briefly close the railway line. 
 
 Police carried out another controlled explosion in the early hours of Thursday morning at an address in the Moss Side area of Manchester. 
 
 Anyone with information about the attack can call the anti-terror hotline on 0800 789321. 
 
 Who are the victims? 
 
 Image caption Clockwise, from top left: Georgina Callander, Saffie Roussos, Olivia Campbell, Martyn Hett, Michelle Kiss, Sorrell Leczkowski, Alison Howe, Lisa Lees, Jane Tweddle-Taylor, Nell Jones, Marcin Klis, Angelika Klis, Kelly Brewster and John Atkinson 
 
 The victims include 14-year-old Sorrell Leczkowski, from Leeds, whose grandmother is critically injured in hospital. 
 
 Others who died are mother-of-three Michelle Kiss, Nell Jones, 14, eight-year-old Saffie Roussos, Alison Howe, Lisa Lees, Jane Tweddle-Taylor, 51, Martyn Hett, 29, and Olivia Campbell, 15. 
 
 Kelly Brewster, 32, John Atkinson, 28, Georgina Callander - thought to be 18 - and Marcin and Angelika Klis, a Polish couple from York, have also been named. 
 
 South Shields couple Chloe Rutherford, 17, and Liam Curry, 19 have been named among the dead. Family members paid tribute to the teenagers and in a statement issued by police said: "They wanted to be together forever and now they are". 
 
 Some of the victims had been making their way outside at the end of the gig when Abedi detonated his "nuts-and-bolts" bomb. 
 
 Others had been waiting in the foyer to pick up children and family. 
 
 A serving Cheshire police officer - off-duty at the time - was also among those killed. She has not yet been named. 
 
 The BBC understands her partner is critically ill and his two children were injured. 
 
 Of the 64 injured, 20 are in a critical condition. Twelve of them are children. 
 
 Mr Hopkins said the families of all those injured had been contacted. 
 
 Who was the attacker? 
 
 Image caption Salman Abedi was described by a former classmate as short-tempered and gullible 
 
 Salman Abedi is understood to have been a 22-year-old born in Manchester to Libyan parents, and a former University of Salford student. 
 
 He attended Burnage Academy for Boys in Manchester between 2009 and 2011, and The Manchester College until 2013. 
 
 Hamid El-Said, who worked for the UN on tackling radicalisation and now works at Manchester Metropolitan University, said Abedi had had a "really bad relationship" with his family and his parents had tried but failed to keep him on the "right path". 
 
 "Eventually he was doing very bad at his university, at his education, and he didn't complete, and they tried to take him back to Libya several times. He had difficulties adjusting to European lifestyle," he said. 
 
 A former classmate of Abedi's told the BBC that he was a "very jokey lad" but also "very short tempered" and would get angry at "the littlest thing". 
 
 The man, who did not want to be identified, said Abedi had hung around "the wrong crowd and was very, very gullible". 
 
 Before leaving Burnage Academy in 2011, Abedi had become "more and more religious", the man added. 
 
 A Muslim community worker, who did not want to be identified, has told the BBC that two people who had known Abedi at college had made separate calls to a hotline to warn the police about his extremist views. 
 
 He said they had been worried that Abedi was "supporting terrorism" and he had expressed the view that "being a suicide bomber was ok". 
 
 The calls are thought to have been made five years ago, he added. 
 
 What does a 'critical' threat level mean? 
 
 Media playback is unsupported on your device Media caption Soldiers on the streets: How security is being stepped up around the country 
 
 Prime Minister Theresa May said soldiers are being placed at Buckingham Palace, Downing Street, embassies and the Palace of Westminster to support armed police in protecting the public. 
 
 Military personnel may also be seen at other events over the coming weeks, such as concerts, Mrs May said, in what she is calling a "proportionate and sensible response". 
 
 Home Secretary Amber Rudd said 984 troops had been deployed in the first instance. Up to 3,800 are available. 
 
 She said she expected the raising of the threat level to critical to be temporary, adding that the bomber had been known "up to a point" by the intelligence services. 
 
 The highest threat level has been reached only twice before: in 2006 during an operation to stop a plot to blow up transatlantic airliners, and a year later when security chiefs were hunting for the men who tried to bomb a London nightclub and attacked Glasgow Airport. 
 
 The Metropolitan Police says it has increased its presence across London, and freed up an extra 1,000 armed officers to patrol crowded places, key sites and transport hubs across the UK. 
 
 The Palace of Westminster has been closed to the public following police advice, and will not re-open until further notice, its website said.
– Authorities have identified the suicide bomber at Ariana Grande's Manchester concert as 22-year-old Salman Abedi. The Telegraph reports that he is a Manchester native, though his parents are from Libya and are believed to have fled the regime of Moammar Gadhafi. UK intelligence officials are now trying to figure out the big question: Was he a lone wolf or did he get help? ISIS has claimed responsibility for the attack, and police have arrested another suspect in connection with it, though it could be awhile before it's clear what, if any, connections Abedi had with them. Coverage: 8 years old: The youngest victim among the 22 fatalities appears to have been Saffie Rose Roussos, who was just 8. She "was simply a beautiful little girl in every aspect of the word," says the head teacher at her school, per NBC News. Another victim was a college student previously pictured with Ariana Grande. Bogus reports: In the immediate aftermath of the bombing, a slew of false stories began circulating online. BuzzFeed debunks them, including one about a supposed gunman outside a hospital. More kids: The BBC has a Q&A on what's known about the attack so far. One detail: Of the 59 injured, 12 are under the age of 16. Chosen target? This looks like "an attack on girls and women," declares the headline on a post by Christina Cauterucci at Slate. Grande's "global brand is one of blissful, unsubdued feminine sexuality," and her audience reflects that, writes Cauterucci. The bombing is a "massive act of gender-based violence." What it was like: The New York Times has a detailed scene story based on the accounts of those who attended the concert, including at least one who thinks security checks were a little loose. Still missing: Families were still trying to track down missing loved ones, and the Manchester Evening News has their pleas and photos. One happy ending: Social media helped track down a 16-year-old girl missing after the show, and ABC News has the details. The girl's distinctive yellow top helped strangers find her at a local hotel. Hopeful thought: Stephen King, no stranger to horror, had this to say about the terror group on Twitter: "ISIS: A rogue cult that has substituted superstition and murder for spirituality. Every bombing hastens the day when they will be no more." Crowdfunding: The Manchester Evening News has set up a crowdfunding campaign for victims' families. It had raised more than $620,000 by 1pm ET on Tuesday.