Armed police block a road near to the Manchester Arena in central Manchester, England, Tuesday, May 23, 2017. An explosion struck an Ariana Grande concert in northern England late Monday, killing over... (Associated Press) 
 
 Armed police block a road near to the Manchester Arena in central Manchester, England, Tuesday, May 23, 2017. An explosion struck an Ariana Grande concert in northern England late Monday, killing over a dozen people and injuring dozens in what police say they are treating as a terrorist attack. (AP... (Associated Press) 
 
 MANCHESTER, England (AP) — An explosion struck an Ariana Grande concert attended by thousands of young music fans in northern England, killing at least 19 people and injuring dozens in what police said Tuesday was being treated as a terrorist attack. 
 
 Greater Manchester Police said 19 people were confirmed dead after the explosion at Manchester Arena. Northwest Ambulance Service said 59 injured people had been taken to hospitals, and a number of "walking wounded" were treated at the scene. 
 
 Police cars, bomb-disposal units and 60 ambulances raced to the scene as the scale of the carnage became clear. 
 
 "We are currently treating this as a terrorist incident until we know otherwise," said Ian Hopkins, chief constable of Greater Manchester Police. 
 
 There was panic after the explosion, which struck around 10:30 p.m. (2130GMT) Monday night as Grande was ending the concert, part of her Dangerous Woman Tour. 
 
 Grande, who was not injured, tweeted hours later: "Broken. From the bottom of my heart, I am so so sorry. I don't have words." 
 
 Manchester Arena said on its website that the blast struck outside the venue as concertgoers were leaving. Some eyewitnesses said it happened in the foyer of the arena just after the concert ended. 
 
 One witness said Grande had just finished her final song and said "Thank you, Manchester," before leaving the stage. 
 
 The incident led to a nightlong search for loved ones as parents tried to locate their teenage children and groups of friends scattered by the explosion sought to find one another. 
 
 Taxi services offered to give stranded concertgoers rides home for free, and residents opened their homes to provide lodging for people who could not get home because public transport had shut down. 
 
 City officials said the true spirit of Manchester would shine through despite the horrendous incident. 
 
 Twitter and Facebook were filled with appeals for information about people who had not been accounted for. 
 
 Jenny Brewster said she was leaving the concert with her 11-year-old daughter when the blast hit. 
 
 "As I turned around, boom, one loud noise," she told Sky News. "A gentleman said 'run!' so we ran." 
 
 Outside, she said, "you could smell the burning." 
 
 Britain's terrorist threat level stands at "severe," the second-highest rung on a five-point scale, meaning an attack is highly likely. 
 
 There was no immediate claim of responsibility. Online, supporters of the extremist Islamic State group, which holds territory in Iraq's Mosul and around its de facto capital in the Syrian city of Raqqa, celebrated the blast. 
 
 One wrote: "May they taste what the weak people in Mosul and (Raqqa) experience from their being bombed and burned," according to the U.S.-based SITE Intelligence Group. 
 
 If the incident is confirmed as a terrorist attack it would be the deadliest in Britain since four suicide bombers killed 52 London commuters on three subway trains and a bus in July 2005. 
 
 "A huge bomb-like bang went off that hugely panicked everyone and we were all trying to flee the arena," said concertgoer Majid Khan, 22. "It was one bang and essentially everyone from the other side of the arena where the bang was heard from suddenly came running towards us as they were trying to exit." 
 
 Added Oliver Jones, 17: "The bang echoed around the foyer of the arena and people started to run." 
 
 Video from inside the arena showed concertgoers screaming as they made their way out amid a sea of pink balloons. 
 
 British Prime Minister Theresa May said the government was working to establish "the full details of what is being treated by the police as an appalling terrorist attack." 
 
 May is due to chair a meeting of the government's COBRA emergency committee later Tuesday. She and other candidates suspended campaigning for Britain's June 8 election after the blast. 
 
 Police advised the public to avoid the area around the Manchester Arena, and the train station near the arena, Victoria Station, was evacuated and all trains canceled. 
 
 The Dangerous Woman tour is the third concert tour by 23-year-old Grande and supports her third studio album, "Dangerous Woman." 
 
 Grande's role as Cat Valentine on Nickelodeon's high school sitcom "Victorious" propelled her to teen idol status, starting in 2010. 
 
 The tour began in Phoenix, Arizona, in February. After Manchester, Grande was to perform at venues in Europe, including Belgium, Poland, Germany, Switzerland and France, with concerts in Latin America and Asia to follow. 
 
 Pop concerts and nightclubs have been a terrorism target before. Almost 90 people were killed by gunmen inspired by the extremist Islamic State group at the Bataclan concert hall in Paris during a performance by Eagles of Death Metal in November 2015. 
 
 In Turkey, 39 people died when a gunman attacked New Year's revelers at the Reina nightclub in Istanbul. 
 
 There was no immediate claim of responsibility for the attack. Online, supporters of Islamic State, which holds territory in Iraq's Mosul and around its de facto capital in the Syrian city of Raqqa, celebrated the incident. One wrote: "May they taste what the weak people in Mosul and (Raqqa) experience from their being bombed and burned," according to the U.S.-based SITE Intelligence Group. 
 
 Manchester, 160 miles (260 kilometers) northwest of London, 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, though no one was killed. 
 
 ___ 
 
 Katz and Lawless reported from London. AP writer Leanne Italie in New York and AP Music Writer Mesfin Fekadu in Jersey City, New Jersey, contributed to this report. ||||| 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. 
 
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 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." 
 
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 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." 
 
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 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. 
 
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 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. ||||| Ariana Grande Manchester Concert: 19 Fatalities Confirmed After Explosion 
 
 UPDATE 3: Manchester police confirmed 19 are dead and around 50 injured. They received "reports of an explosion at Manchester Arena" just before 10:35pm local time. British Transportation Police report, "Officers are at Manchester Arena following reports of an explosion within the foyer area of the stadium at 10.30pm this evening." NBC reports that officials suspect a suicide bomber is to blame for the incident. 
 
 Latest statement on incident at Manchester Arena pic.twitter.com/BEpLOan3dY — G M Police (@gmpolice) May 23, 2017 
 
 UPDATE 2: Manchester's regional counter terrorism unit is treating this as a possible terrorist incident, according to the BBC's Daniel Sandford. 
 
 The North West Counter Terrorism Unit is treating the incident at #ManchesterArena as a possible terrorist incident. — Daniel Sandford (@BBCDanielS) May 22, 2017 
 
 UPDATE 1: Greater Manchester Police have issued a statement that there have been a number of confirmed fatalities and others injured at Manchester Arena. An on-the-ground source tells Billboard at least 18 have been reported dead. 
 
 Police statement on incident at Manchester Arena pic.twitter.com/gaKASukx9a — G M Police (@gmpolice) May 22, 2017 
 
 Emergency services have rushed to the U.K.'s Manchester Arena where Ariana Grande had been performing Monday (May 22) after concertgoers claim two explosions were heard. 
 
 Billboard has confirmed Grande is "okay" with the singer's rep and that her team is further investigating what happened. Supporting act BIA confirmed she and her team were also "okay." 
 
 So far no official report has been issued, but people at the concert and in the surrounding area are posting on social media that there were two bangs and people running out of the 21,000-person capacity arena. 
 
 CNN spoke to one of the concertgoers, Kiera Dawber, immediately after she exited the arena. Dawber said she saw "at least" 20 dead, and didn't think it looked like the deaths were the result of a stampede. "There was a massive explosion, a bang, smoke coming through the steps…It was just chaos." 
 
 Going through corridors to exit the arena, Dawber described seeing "at least 20, 30 people on the floor. Just… dead. You could see they were passed away, some people with injuries. There was a guy holding what looked like his wife and she wasn't in a good state….There was blood and shoes and handbags and bits of food and phones….I don't think I'll ever get rid of the images." 
 
 One man captured video of an emergency vehicle racing to the scene. See it here: 
 
 Two loud bangs heard around Manchester arena. People running out of the arena. No idea what's going on pic.twitter.com/KaRzQckvEE — Alan Brennan (@alanbmufc92) May 22, 2017 
 
 Others shared video from from the frightening scene inside the arena: 
 
 EXPLOSION AT MANCHESTER ARENA AND EVERYONE RAN OUT SO SCARY-- pic.twitter.com/pJbUBoELtE — ♡♡ (@hannawwh) May 22, 2017 
 
 New video shows mass panic as fans flee Ariana Grande concert at the #Manchester Arena after 2 explosions.pic.twitter.com/gufS5r7tRj — Tennessee (@TEN_GOP) May 22, 2017 
 
 I was inside Ariana Grande's concert in Manchester Arena. Right at the end a explosion was heard. Smoke on the corridors and blood — Critico en serio (@criticoenserio) May 22, 2017 
 
 Wtf is happening in Manchester arena? Massive bang & everyone is running & screaming, people are crying — Rebecca B (@RebeccaBx) May 22, 2017 
 
 Network Rail has told Reuters U.K. and other outlets that all train lines out of the Manchester Victoria station are currently blocked with emergency services in attendance. Mancunians around the arena are offering to take in anyone stranded in the area with the hashtag #RoomforManchester on Twitter. 
 
 Local police are calling it a "serious incident" and asking people to stay away from the area. 
 
 Emergency services responding to serious incident at Manchester Arena. Avoid the area. More details will follow as soon as available — G M Police (@gmpolice) May 22, 2017 
 
 Greater Manchester is the United Kingdom's second-most populous urban area with a population of 2.55 million. 
 
 We will update as more details become available. ||||| (CNN) Singer Ariana Grande had just performed her last song, "Dangerous Woman," to delighted fans, and the lights had just come on. 
 
 As the crowd began to move, many of them children wearing bunny ears like their idol, eyewitnesses at Monday's concert at the Manchester Arena described a loud, sharp bang, and then chaos broke out. 
 
 "Ariana had just finished her last song. We were getting ready to leave the arena and the next minute we heard a mighty bang coming from the left-hand side of the arena," Carole Long, who was at the concert with her 10-year-old daughter Robin, told CNN. 
 
 "Everyone went crazy and was running and screaming and trying to get out and jumping over seats. How we weren't crushed to death is amazing. People were just pushing and pushing and pushing. The stewards were screaming at people to get out." 
 
 Other witnesses say the sound of what police believe was an improvised explosive device -- detonated by one man who was killed in the blast -- was short and sharp like a gun shot, and then the air was filled with smoke. 
 
 Twenty two people have been conformed dead, some of them children, and dozens others injured in the worst terror attack in Britain for 12 years. 
 
 The crowd was made up of mainly young people who had come to see Grande in her first of three scheduled concerts in the UK, on her European and Latin American tour. 
 
 Police help victims of the attack on Monday night. 
 
 Abby Mullen, who had traveled down from Scotland for the gig, posted her recollection of the horrific attack on Facebook from her hotel room. 
 
 "I thought we would leave seconds before the last song finished ... to get home quicker instead of waiting longer for a taxi. As we were leaving a bomb or explosion went off meters in front of me", she wrote. 
 
 "Peoples skin, blood and faeces where (sic) everywhere including in my hair & on my bag. I'm still finding bits of god knows what in my hair." 
 
 Helpers attend to injured people at Manchester Arena on Monday night. 
 
 Andy James had taken his nine-year-old brother to what was his first ever pop concert. He said the explosion happened at around 10:40 p.m. as they were walking up the stairs to leave. 
 
 "It must have been about 40 feet from where we were. We heard the explosion and the boom rattled in my chest. You could just feel it on the ground. 
 
 "We left to go in the opposite direction of where the explosion happened. There was a stampede of people, I was trying to help people up as we were leaving. 
 
 James said that as he ushered his little brother out, "I had my hand on his chest and his heart was beating so fast." 
 
 The scene outside Manchester Arena on Monday night. 
 
 'Bodies scattered' 
 
 "There was just bodies scattered about everywhere ... it was just chaos," Kiera Dawber told CNN. "There was at least 20 or 30 people on the floor, some that you could see straight off were just ... just dead." 
 
 Dawber said she saw a man holding his wife. "She wasn't in a very good state," Dawber said. 
 
 "The injuries I saw ... it didn't look like the sort of injuries that people get from tripping over people in a hurry," said Joel Goodman, a freelance photographer on the scene. 
 
 Parents shouting out and yelling names 
 
 Ivo Delgado, another witness, recalled hearing one explosion before he saw people running. 
 
 "It was more a moment of confusion, but still the bang was really great, really massive," he said. "I saw at least 3 people on the floor injured." 
 
 "There was a lot of little girls running out, and parents shouting out and yelling names," Delgado said. 
 
 Photos: Deadly explosion at Ariana Grande concert People in Manchester, England, gather in St. Ann's Square on Thursday, May 25. They were observing a national minute of silence to remember the victims of a suicide bombing at an Ariana Grande concert. Hide Caption 1 of 22 Photos: Deadly explosion at Ariana Grande concert Britain's Queen Elizabeth II speaks to 15-year-old Millie Robson and her mother, Marie, during a visit to the Royal Manchester Children's Hospital on May 25. The Queen was visiting those injured in the attack. Hide Caption 2 of 22 Photos: Deadly explosion at Ariana Grande concert A police officer guards a house in Manchester as investigations continued on May 25. Police say a man carrying explosives acted as a lone attacker and died in the blast. Hide Caption 3 of 22 Photos: Deadly explosion at Ariana Grande concert Flowers and tribute messages are left for victims in St. Ann's Square. Hide Caption 4 of 22 Photos: Deadly explosion at Ariana Grande concert A women sheds tears after observing the minute of silence in St. Ann's Square. Hide Caption 5 of 22 Photos: Deadly explosion at Ariana Grande concert A Manchester road is closed off as police raids continued on May 25. Hide Caption 6 of 22 Photos: Deadly explosion at Ariana Grande concert Local residents hold Manchester City and Manchester United soccer jerseys during the national minute of silence. Hide Caption 7 of 22 Photos: Deadly explosion at Ariana Grande concert Police officers deliver flowers to a makeshift memorial in Manchester on Wednesday, May 24. Hide Caption 8 of 22 Photos: Deadly explosion at Ariana Grande concert Women cry after placing flowers in Manchester on May 24. Hide Caption 9 of 22 Photos: Deadly explosion at Ariana Grande concert A forensics team works at the scene of the explosion on Tuesday, May 23. Hide Caption 10 of 22 Photos: Deadly explosion at Ariana Grande concert British Prime Minister Theresa May condemns the "callous terrorist attack" as she delivers a statement in London on May 23. Hide Caption 11 of 22 Photos: Deadly explosion at Ariana Grande concert Police help someone after the attack at Manchester Arena on Monday, May 22. Hide Caption 12 of 22 Photos: Deadly explosion at Ariana Grande concert People gather outside the arena. "We can confirm there was an incident as people were leaving the Ariana Grande show last night," police said on Twitter early on Tuesday. "The incident took place outside the venue in a public space. Our thoughts and prayers go out to the victims." Hide Caption 13 of 22 Photos: Deadly explosion at Ariana Grande concert People receive medical attention at a railway station close to the arena. The incident happened shortly after Grande had left the stage, shortly after 10:30 p.m. (5:30 p.m. ET) according to eyewitnesses. Calvin Welsford, an 18-year-old concertgoer, said that he heard a "loud bang" a couple of minutes after Grande's set had finished. Hide Caption 14 of 22 Photos: Deadly explosion at Ariana Grande concert Paramedics respond to the scene. Hide Caption 15 of 22 Photos: Deadly explosion at Ariana Grande concert Emergency workers and concert attendees gather outside the arena. Hide Caption 16 of 22 Photos: Deadly explosion at Ariana Grande concert People stand by a cordoned-off street close to the arena. Hide Caption 17 of 22 Photos: Deadly explosion at Ariana Grande concert Greater Manchester Police tweeted that emergency services were "responding to (a) serious incident at Manchester Arena. Avoid the area. More details will follow as soon as available." Hide Caption 18 of 22 Photos: Deadly explosion at Ariana Grande concert People are escorted away from the arena. Hide Caption 19 of 22 Photos: Deadly explosion at Ariana Grande concert People sit outside near the arena. The crowd was made up of mainly younger people who had come to see Grande in her first of three scheduled concerts in the UK. Hide Caption 20 of 22 Photos: Deadly explosion at Ariana Grande concert An injured man is helped at the scene. Hide Caption 21 of 22 Photos: Deadly explosion at Ariana Grande concert People hug near armed police who responded to the scene. Hide Caption 22 of 22 
 
 Sam Ward, who lives by the arena, said the loud bang sounded "really nothing like I have ever heard in the city center before." 
 
 "Initially after the first wave of sirens and the initial evacuation, it was filled with cars. The roads were actually bedlam. People actually going through red lights," he said. 
 
 Search for the missing 
 
 JUST WATCHED Mom: I don't know if daughter is dead or alive Replay More Videos ... MUST WATCH Mom: I don't know if daughter is dead or alive 01:22 
 
 Meanwhile the search goes on for those still missing, including Charlotte Campbell's 15-year-old daughter Olivia, who had gone to the concert with her friend Adam to celebrate his birthday. 
 
 Campbell had spoken to her daughter just before 10 p.m. but hasn't heard from her since. 
 
 "We've tried everything we can. They're telling us to wait by the phones," Campbell told CNN. "Her dad is out looking ... It's the most horrible feeling ever, to know your daughter is there and you don't know whether she's dead or alive. 
 
 "I want her home and I want her safe ... I just want her to walk through the door." 
 
 Her daughter has been registered as a missing person. ||||| Manchester, England (CNN) The UK raised its terrorism threat level to "critical" -- the highest level -- for the first time in a decade Tuesday. 
 
 Prime Minister Theresa May warned that intelligence services believe an attack may be "imminent." 
 
 Hours earlier, police identified 22-year-old Salman Abedi as the suspected suicide attacker who detonated a bomb as throngs of teenagers poured out of an Ariana Grande concert in Manchester, killing 22 people. 
 
 People hug near armed police who responded to the scene. 
 
 People hug near armed police who responded to the scene. 
 
 An injured man is helped at the scene. 
 
 An injured man is helped at the scene. 
 
 People sit outside near the arena. The crowd was made up of mainly younger people who had come to see Grande in her first of three scheduled concerts in the UK. 
 
 People sit outside near the arena. The crowd was made up of mainly younger people who had come to see Grande in her first of three scheduled concerts in the UK. 
 
 People are escorted away from the arena. 
 
 People are escorted away from the arena. 
 
 Greater Manchester Police tweeted that emergency services were "responding to (a) serious incident at Manchester Arena. Avoid the area. More details will follow as soon as available." 
 
 Greater Manchester Police tweeted that emergency services were "responding to (a) serious incident at Manchester Arena. Avoid the area. More details will follow as soon as available." 
 
 People receive medical attention at a railway station close to the arena. The incident happened shortly after Grande had left the stage, shortly after 10:30 p.m. (5:30 p.m. ET) according to eyewitnesses. Calvin Welsford, an 18-year-old concertgoer, said that he heard a "loud bang" a couple of minutes after Grande's set had finished. 
 
 People receive medical attention at a railway station close to the arena. The incident happened shortly after Grande had left the stage, shortly after 10:30 p.m. (5:30 p.m. ET) according to eyewitnesses. Calvin Welsford, an 18-year-old concertgoer, said that he heard a "loud bang" a couple of minutes after Grande's set had finished. 
 
 People gather outside the arena. "We can confirm there was an incident as people were leaving the Ariana Grande show last night," police said on Twitter early on Tuesday. "The incident took place outside the venue in a public space. Our thoughts and prayers go out to the victims." 
 
 People gather outside the arena. "We can confirm there was an incident as people were leaving the Ariana Grande show last night," police said on Twitter early on Tuesday. "The incident took place outside the venue in a public space. Our thoughts and prayers go out to the victims." 
 
 Police help someone after the attack at Manchester Arena on Monday, May 22. 
 
 Police help someone after the attack at Manchester Arena on Monday, May 22. 
 
 British Prime Minister Theresa May condemns the "callous terrorist attack" as she delivers a statement in London on May 23. 
 
 A forensics team works at the scene of the explosion on Tuesday, May 23. 
 
 A forensics team works at the scene of the explosion on Tuesday, May 23. 
 
 Women cry after placing flowers in Manchester on May 24. 
 
 Women cry after placing flowers in Manchester on May 24. 
 
 Police officers deliver flowers to a makeshift memorial in Manchester on Wednesday, May 24. 
 
 Police officers deliver flowers to a makeshift memorial in Manchester on Wednesday, May 24. 
 
 Local residents hold Manchester City and Manchester United soccer jerseys during the national minute of silence. 
 
 Local residents hold Manchester City and Manchester United soccer jerseys during the national minute of silence. 
 
 A Manchester road is closed off as police raids continued on May 25. 
 
 A Manchester road is closed off as police raids continued on May 25. 
 
 A women sheds tears after observing the minute of silence in St. Ann's Square. 
 
 A women sheds tears after observing the minute of silence in St. Ann's Square. 
 
 Flowers and tribute messages are left for victims in St. Ann's Square. 
 
 Flowers and tribute messages are left for victims in St. Ann's Square. 
 
 A police officer guards a house in Manchester as investigations continued on May 25. Police say a man carrying explosives acted as a lone attacker and died in the blast. 
 
 Britain's Queen Elizabeth II speaks to 15-year-old Millie Robson and her mother, Marie, during a visit to the Royal Manchester Children's Hospital on May 25. The Queen was visiting those injured in the attack. 
 
 People in Manchester, England, gather in St. Ann's Square on Thursday, May 25. They were observing a national minute of silence to remember the victims of a suicide bombing at an Ariana Grande concert. 
 
 Key developments 
 
 Police have carried out two raids in Manchester. 
 
 Queen Elizabeth II described bombing as "act of barbarity." 
 
 59 people injured, some in life-threatening situations. 
 
 US President Donald Trump slams attackers as "losers." 
 
 Ariana Grande suspends her world tour. 
 
 Lone attacker? 
 
 The suspect apparently acted as a lone attacker and died in the blast Monday night, police said, which left the wounded and the dead scattered across the arena's bloodied entrance and sent screaming girls running for cover. 
 
 The bombing has drawn condemnation and horror from around the world as a heinous assault targeting children. 
 
 Teen concertgoer Olivia Campbell, whose mother spoke to CNN during an agonizing wait for news from her daughter, is the latest victim to have been confirmed dead. 
 
 Fifteen-year-old Olivia had gone to the concert with her friend Adam to celebrate his birthday. She is one of four victims, including eight-year-old Saffie Rose Roussos , who have been identified. 
 
 Olivia Campbell, 15, had been confirmed as one of the dead. 
 
 While police believe Abedi acted alone, May warned that investigators could not discount the possible involvement of a "wider group" of terrorists. 
 
 The raising of the terror threat level means "not only that another attack remains highly likely but that a further attack may be imminent," she said. 
 
 It will enable the government to deploy armed military personnel of support of police and other security forces, particularly in the guarding of key sites, concerts and sporting events, May said. 
 
 Emergency crews evacuated victims at the Manchester Arena Monday night. 
 
 "I do not want the public to feel unduly alarmed," she said, calling the response "proportionate and sensible" to the threat level. 
 
 The blast marked the deadliest terror attack on British soil since the 2005 London bombings. 
 
 Claim of responsibility 
 
 ISIS claimed responsibility for the attack but offered no evidence. The terror group said on its Telegram channel Tuesday that a "soldier of the caliphate" was able to "plant explosive devices" at the arena, a US counterterrorism source told CNN. 
 
 ISIS routinely claims attacks it has no proven connection to. 
 
 Authorities have discovered no evidence of a link between the attacker and an established terror group, a British counterterrorism official told CNN. 
 
 A US counterterrorism official said bombing "looks much like" an ISIS attack but that American intelligence officials were working with British counterparts to determine more. 
 
 No determination has been made on the sophistication of the explosive device or what chemicals were involved, the official said. 
 
 Remembering the victims 
 
 "We will stand together to say that this city is greater than the force that aligns itself against it," David Walker, Bishop of Manchester, told the crowd. 
 
 "We are sending a signal not just to Manchester, but across the world that you can not defeat us because love in the end is always stronger than hate." 
 
 Saffie Rose Roussos, 8, was among those killed in the Manchester Arena attack. 
 
 Eight-year-old Saffie Rose Roussos from Leyland has been named as one of the fatalities, the Lancashire County Council confirmed. 
 
 Chris Upton, the head teacher at the Tarleton Community Primary School, described her as "simply a beautiful little girl" who was "quiet and unassuming with a creative flair." 
 
 Georgina Callander, 18, was also killed, according to her school, the Bishop Rawstorne Church of England Academy. 
 
 "All of our students will gather together today for a time of prayer and reflection and to give thanks for the life of Georgina," the school said. 
 
 At least 12 victims aged 16 or under were being treated at a children's hospital for serious injuries, some of them fighting for their lives, a Manchester health official said. 
 
 Grande, who had just finished the first of three scheduled UK performances, tweeted about her devastation several hours later: "broken. from the bottom of my heart, i am so so sorry. i don't have words." 
 
 broken. 
 
 from the bottom of my heart, i am so so sorry. i don't have words. — Ariana Grande (@ArianaGrande) May 23, 2017 
 
 The pop star has suspended her "Dangerous Woman" tour following the attack, a source with knowledge of the situation told CNN. Grande was scheduled to perform in London and across Europe through mid-June. 
 
 Queen Elizabeth II said Tuesday that "the whole nation has been shocked." 
 
 Around 400 police were deployed overnight following the attack, and on Tuesday, large groups of armed police were seen in several parts of the city. Security was boosted in London. 
 
 A poster from an Ariana Grande fan sits alongside flowers at Manchester's St Ann's Square. #manchesterattack A post shared by Bryony Jones (@bryonysjones) on May 23, 2017 at 7:40am PDT 
 
 Trump calls attackers 'losers' 
 
 JUST WATCHED Pres. Trump: Manchester attacked by losers Replay More Videos ... MUST WATCH Pres. Trump: Manchester attacked by losers 02:05 
 
 US President Donald Trump slammed the attack, saying that terrorists were "losers." 
 
 "So many young beautiful innocent people living and enjoying their lives murdered by evil losers in life. I won't call them monsters because they would like that term. They would think that's a great name. I will call them from now on losers because that's what they are," he said. "This wicked ideology must be obliterated." 
 
 The US Department of Homeland Security said it was "closely monitoring" the situation.
– Police say an explosion at an Ariana Grande concert in northern England has killed at least 19 people and injured about 50, the AP reports. Billboard has confirmed that the American singer herself is OK. Police suspect a suicide bomber set off the blast, which is being treated as a terrorist attack unless new information emerges, NBC News reports. A statement from Manchester Arena said the explosion took place outside the arena just after the concert, as people were exiting. "A huge bomb-like bang went off that hugely panicked everyone and we were all trying to flee the arena," concertgoer Majid Khan, 22, tells Britain's Press Association. "It was one bang and essentially everyone from the other side of the arena where the bang was heard from suddenly came running towards us as they were trying to exit." Video from inside the arena showed concertgoers screaming as they made their way out amid a sea of pink balloons. Authorities say most of those being taken to the hospital had shrapnel injuries. "Praying for everyone at Ariana Grande's show," tweeted Katy Perry, one of the many celebs taking to Twitter to voice support, per CBS News. Britain's terrorist threat level has been set at "severe" in recent years, indicating an attack is highly likely. Reuters reports Manchester Arena is the biggest indoor arena in all of Europe, and can hold 21,000. The concert was part of the 23-year-old Grande's Dangerous Woman Tour. After Manchester, Grande was to perform at venues in Belgium, Poland, Germany, Switzerland, and France, with concerts in Latin America and Asia to follow.