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? ||||| Undated handout photo from an unnamed source made available on Wednesday May 24, 2017 of Salman Abedi. ??British authorities identified Salman Abedi as the bomber who was responsible for Monday's explosion... (Associated Press) 
 
 Undated handout photo from an unnamed source made available on Wednesday May 24, 2017 of Salman Abedi. ??British authorities identified Salman Abedi as the bomber who was responsible for Monday's explosion in Manchester which killed more than 20 people. (AP) (Associated Press) 
 
 MANCHESTER, England (AP) — Security forces rounded up more suspects Wednesday in the deadly Manchester concert blast and soldiers fanned out across the country to national landmarks as an on-edge Britain tried to thwart the possibility of additional attacks. 
 
 Officials scoured the background of the British-born ethnic Libyan identified as the bomber, saying he was likely part of a wider terrorist network. Additional arrests were made both in Britain and in Libya in the bombing that killed 22 people and wounded scores more. 
 
 Among those taken into custody in Libya were the suspected bomber's father and his younger brother, the latter of whom confessed to knowing "all the details" of the attack plot, Libyan anti-terror authorities said. 
 
 "I think it's very clear this is a network we are investigating," Chief Constable Ian Hopkins of the Manchester Police said as authorities raided British properties thought to be connected to Salman Abedi, the 22-year-old suspected bomber who grew up in Manchester and died in the attack. 
 
 British Home Secretary Amber Rudd said Abedi "likely" did not act alone in the strike at the close of an Ariana Grande concert Monday night and that he had been known to security forces "up to a point." Meanwhile, officials probed possible travel by the alleged bomber, looking for clues to new threats. 
 
 Government officials said nearly 1,000 soldiers were deployed to Buckingham Palace, Parliament and other high-profile sites across the country. Britain's terror threat level was raised to "critical" — the highest level — on Tuesday over concern another attack could be imminent. 
 
 French Interior Minister Gerard Collomb said Abedi was believed to have traveled to Syria and had "proven" links to the Islamic State group, which claimed responsibility for the attack. British officials, however, have not commented on whether Abedi had links to IS or other extremist groups. 
 
 British authorities were probing whether Abedi had ties to other cells across Europe and North Africa, according to two officials familiar with the case who spoke on condition of anonymity because they were not authorized to speak about the ongoing investigation. 
 
 They said one thread of the inquiry involved pursuing whether Abedi was part of a larger terror cell that included Mohamed Abrini, otherwise known as "the man in the hat," with connections to the Brussels and Paris attacks. Abrini visited Manchester in 2015. 
 
 "It looks like we're not dealing with a lone wolf situation. There's a network — a cell of ISIS-inspired terrorists," said U.S. Rep. Mike McCaul, R-Texas, chairman of the House Homeland Security Committee. He said the bomb's construction suggested a "level of sophistication" that might indicate foreign training. 
 
 Six additional arrests were made in Britain on Wednesday as the sprawling investigation extended to Libya, where Abedi's father and 18-year-old brother were detained in Tripoli. The father, Ramadan Abedi, denied his son had links to militants in an interview with The Associated Press before he was taken into custody, saying, "We don't believe in killing innocents." 
 
 The elder Abedi was allegedly a member of the al-Qaida-backed Libyan Islamic Fighting group in the 1990s, according to a former Libyan security official, Abdel-Basit Haroun. 
 
 The Libyan anti-terror force that arrested the men said in a statement that the brother, Hashim Abedi, 18, confessed that he and his brother were linked to the Islamic State group and that he was aware of the arena bombing plan. The anti-terror force said the father had not been charged, but was taken in for questioning. 
 
 A second brother, Ismail Abedi, 23, was taken into custody in Manchester a day earlier. 
 
 The suspected bomber grew up in Manchester's southern suburbs and once attended Salford University there. Neighbors recalled him as tall, thin and quiet, and said he often wore traditional Islamic dress. Among investigators' areas of interest is how often Abedi traveled to Libya, which has seen an eruption of armed Islamist groups since dictator Moammar Gadhafi was overthrown and killed in 2011. 
 
 Before his arrest, Abedi's father said he had last spoken to his son five days ago and he sounded "normal." He said his son was getting ready to visit Saudi Arabia for a short Umrah pilgrimage then planned to head to Libya to spend the Islamic holy month of Ramadan with his family. He said his son last visited Libya about six weeks ago and had never gone to Syria. He denied ties to any militant groups or suggestions of extremism. 
 
 "We aren't the ones who blow up ourselves among innocents," he said. "We go to mosques. We recite Quran, but not that." 
 
 At Manchester's Didsbury Mosque, where the Abedi family worshipped, the bombing was condemned and reports that the suspected bomber had worked there were denied. Azhar Mahmoud, who prays at the mosque in southern Manchester, said it was "horrible" that Abedi was associated with it. 
 
 "Wherever he got that, he didn't get it from this mosque," he said, adding that the imam regularly preached against radicalization. 
 
 British Prime Minister Theresa May chaired a meeting Wednesday of her emergency security cabinet group to talk about intelligence reports on Abedi and concerns that he might have had outside support. Police raided homes believed to be connected with the investigation. 
 
 At one apartment building in Manchester, heavily armed police swarmed in and a controlled explosion was heard. At another property, a house a 10-minute walk from where Abedi lived, neighbors said they were awakened by a loud noise and saw a man hauled away in handcuffs. 
 
 "There was a policeman, armed policeman, shouting," neighbor Omar Alfa Khuri said. "And I realized there is something wrong here." 
 
 Across London, troops fanned out and authorities reconsidered security plans. The changing of the guard ceremony at Buckingham Palace was canceled so police officers could be re-deployed. The Palace of Westminster, which houses Parliament, was shuttered to those without passes, and tours and events were canceled until further notice. Armed police patrolled outside St. Paul's Cathedral in London, another popular tourist spot. 
 
 For a second night, a throng of people filled a Manchester square for a vigil for the victims. Muslim, Christian and Jewish leaders echoed a message that extremists wouldn't drive a wedge among the city's religious groups. People lifted their hands in the air during a moment of silence. 
 
 "There are no divisions here tonight," Irfan Chishti, the imam of Manchester's biggest mosque, told the crowd. 
 
 Officials said all of the bombing victims have been identified, but names were being withheld until autopsies were completed. 
 
 Still, their stories began to emerge: Michelle Kiss, a mother of three whose "family was her life;" Nell Jones, an "always smiling" teenager; Martyn Hett, who packed life "to the brim with his passions;" Jane Tweddle, a "bubbly, kind, welcoming" receptionist. The youngest known of those killed was just 8. Besides the dead, the number of people who sought medical help after the attack was raised to 119. Officials said 64 people remained hospitalized, including 20 who were critically injured. 
 
 __ 
 
 Michael reported from Cairo and Katz reported from London. Associated Press writers Sylvia Hui and Paisley Dodds in London, Rob Harris in Manchester, Angela Charlton in Paris; Deb Riechmann in Washington; and Matt Sedensky in New York contributed to this report. ||||| "Very important" items have been found in property searches after the Manchester attack and "significant" arrests have been made, say police. 
 
 Eight men are currently in custody, including the bomber's older brother. 
 
 Two more people were arrested overnight in Greater Manchester, following other raids and arrests on Wednesday in Manchester, Wigan and Nuneaton in Warwickshire. 
 
 Chief Constable Ian Hopkins told reporters: "The arrests that we have made are significant, and initial searches of premises have revealed items that we believe are very important to the investigation." 
 
 :: LIVE: The latest updates on the Manchester attack 
 
 He said "associated searches" were now taking place at a number of addresses. 
 
 Image: Salman Abedi (centre), his brother (left) Hashem Abedi and father Ramadan Abedi 
 
 A Whitehall source told Sky News that bomber Salman Abedi was one of many former "subjects of interest" (SOI) for MI5, and apparently not being actively investigated. 
 
 The source said: "Abedi was one of a larger pool of former subjects of interest whose risk remained subject to review by MI5 and its partners. 
 
 "Where former SOIs show sufficient risk of re-engaging in terrorism, MI5 can consider reopening the investigation, but this process inevitably relies on difficult professional judgements based on partial information." 
 
 The source said MI5 is managing 500 active investigations, involving some 3,000 subjects at any one time. 
 
 :: Why many terror suspects are not being watched 
 
 Image: People observed the silence in St Ann's Square in Manchester 
 
 People across the country fell silent at 11am to remember the 22 people murdered by Abedi at Manchester Arena. 
 
 Thousands paused at their workplaces, and crowds stopped at public places including Manchester's Albert Square and Trafalgar Square in London. 
 
 Minutes ahead of the Queen's arrival, doctors and nurses at Royal Manchester Children's Hospital also stood together to remember the victims - many of whom are still being treated. 
 
 Police are continuing to piece together the killer's final days, with the 22-year-old transiting through Dusseldorf in Germany about four days before the attack. 
 
 Image: The Queen visited the Royal Manchester Children's Hospital 
 
 It is believed he was on his way back from a trip to Libya, where his younger brother and father live. They, too, have now been arrested. 
 
 CCTV footage also appears to place Abedi at Manchester's Arndale shopping centre at around 8pm on Friday. 
 
 Images show a man with a backpack similar to the one pictured blown to shreds in photos leaked to US media. 
 
 The pictures are said to have caused fury among police and security services, with Theresa May to raise the issue with Donald Trump at the NATO summit, and some intelligence sharing put on pause. 
 
 The night of his attack, Abedi stayed in a £75-per-night flat close to the arena. 
 
 Image: CCTV from the Arndale is thought to show Abedi with the backpack 
 
 Image: Pictures published in the US appearing to show remnants of the backpack 
 
 Police have said it is "very clear" there is a "terror network" that is likely to have helped the Manchester-born attacker. 
 
 Sky News has found Abedi had links to an Islamic State cell which operated in the city, and knew one of the terror group's most prolific recruiters. 
 
 The sophistication of Abedi's device has led to concerns a bomb maker could still be at large. 
 
 Police searched a semi-detached house in Nuneaton, Warwickshire, overnight, after a man was arrested there on Wednesday. 
 
 Neighbours said a Libyan-born father-of-five named named Naser Elshetwi lived at the house, but the identity of the person arrested has not been confirmed. 
 
 Police in balaclavas also mounted an early-morning raid at a house in Manchester's Moss Side, using a controlled explosion to gain entry. No arrests were reported by police. 
 
 There was another overnight raid on a flat in the city's Withington area - where one man was arrested. 
 
 1:49 Video: Salman Abedi and the Manchester terror cell 
 
 Neighbours said a man and woman lived there with three children. One resident in the street told reporters she had spoken to the woman, who said she was from Libya. 
 
 :: The victims of the Manchester terror attack 
 
 Meanwhile, Abedi's father and brother have also been detained in Libya. 
 
 Ramadan Abedi, and 20-year-old Hashem Abedi were arrested in capital, Tripoli. 
 
 Authorities say Hashem was preparing his own attack in the city and knew about his brother's plot. 
 
 When arrested he is reported to have said: "I have ideology with my brother... I know everything about my brother, what he was doing there in Manchester." ||||| BRUSSELS/LONDON (Reuters) - President Donald Trump said on Thursday that “deeply troubling” leaks to U.S. media about the Manchester suicide bombing would be investigated, after irate British police briefly stopped sharing information with U.S. agencies. 
 
 U.S. President Donald Trump (L) and Britain's Prime Minister Theresa May react during a ceremony at the new NATO headquarters before the start of a summit in Brussels, Belgium, May 25, 2017. REUTERS/Christian Hartmann 
 
 Prime Minister Theresa May raised British concerns with Trump at a NATO summit in Brussels, telling him intelligence shared between their two countries had to remain secure, in a rare public show of dissatisfaction with Britain’s closest security ally. 
 
 After a suspension that lasted about a day, Britain’s most senior counter terrorism officer said late on Thursday that the police had resumed sharing information with the United States after receiving “fresh assurances”. 
 
 Trump had called the leaks “deeply troubling”. 
 
 “I am asking the Department of Justice and other relevant agencies to launch a complete review of this matter, and if appropriate, the culprit should be prosecuted to the fullest extent of the law,” he said in a statement released after his arrival in Brussels. 
 
 The row comes as British police stepped up their investigation into a suspected network behind Salman Abedi, a 22-year-old British-born man with Libyan parents who blew himself up on Monday night at the Manchester Arena indoor venue after a concert by U.S. singer Ariana Grande 
 
 The singer’s fans are mostly children and teenagers and the explosion killed 22 people, ranging from an eight-year-old schoolgirl to parents who had come to pick up their children. 
 
 Police are holding eight people in custody in connection with the attack and bomb disposal units were used in searches as officers raided properties across the city. 
 
 In the nearby town of Wigan, where a man was arrested on Wednesday, police said they had discovered potentially suspicious items, prompting them to bring in the bomb squad and evacuate properties in the area. The security alert was later lifted. 
 
 Police said they were making good progress. 
 
 “I want to reassure people that the arrests that we have made are significant, and initial searches of premises have revealed items that we believe are very important to the investigation,” Manchester’s police chief Ian Hopkins said. 
 
 With the official threat level raised to “critical”, meaning a further attack could be imminent, troops have been deployed to free up police, and armed officers patrolled trains for the first time in Britain. 
 
 The state-run National Health Service said all 27 major trauma units in England had told staff to be prepared for a possible attack, ahead of the weekend and a public holiday on Monday. 
 
 BOMB-MAKER? 
 
 Abedi had recently returned from Libya, where his father and younger brother were arrested by a militia on Wednesday. 
 
 Abedi passed through Istanbul on his way to Europe, Turkish security officials told Reuters, but said there were no records of him entering Syria during his travels as had been suggested on Wednesday by the French interior minister. [L8N1IR4RV] 
 
 A source with knowledge of the investigation told Reuters Abedi might have made the bomb himself or with some assistance from an accomplice. That was a change from previous thinking that a bomb-maker might be at large. 
 
 “The focus is still the search for accomplices and the network but he could have made this bomb himself,” the source said. 
 
 Over the past three days, several key details of the investigation, including the name of the bomber, first came out in U.S. media, angering British police who feared such leaks risked compromising their investigation. 
 
 May raised the matter with Trump as they gathered for a group photograph at the NATO summit. 
 
 “She expressed the view that the intelligence sharing relationship we have with the U.S. is hugely important and valuable, but that the information that we share should be kept secure,” a British government source said. 
 
 U.S. Attorney General Jeff Sessions also spoke to Britain’s interior minister Amber Rudd about the issue. The U.S. Justice Department said it had initiated steps to address the “rampant leaks”, which it said could not be tolerated. 
 
 The decision to stop sharing police information with U.S. agencies was an extraordinary step for Britain, which is usually at pains to emphasize its “special relationship” with the United States. 
 
 “While we do not usually comment on information sharing arrangements ... having received fresh assurances, we are now working closely with our key partners around the world,” said Mark Rowley, Britain’s lead officer for counter-terrorism policing. 
 
 British authorities did not say the investigation had in fact been compromised by the leaks. 
 
 The attack injured 116 people, of whom 75 were admitted to hospital and 23 remain in a very serious condition, health authorities said. 
 
 Queen Elizabeth visited the Royal Manchester Children’s Hospital, where some of the casualties have been treated, and was filmed chatting with a girl lying injured on a ward. She described the attack as “very wicked”. 
 
 “A CITY UNITED” 
 
 A minute’s silence was observed in honor of the victims at a square in central Manchester, after which crowds broke into an emotional chorus of “Don’t Look Back in Anger”, an old hit song by the band Oasis who are from the city. 
 
 The city’s two giant soccer clubs, Manchester United and Manchester City, laid aside their rivalry to jointly donate 1 million pounds ($1.3 million) to an emergency fund set up to support families affected by the attack. They labeled their initiative “A City United”. 
 
 The bombing has caused revulsion across the world for targeting children and teenagers. Former U.S. President Barack Obama, meeting German Chancellor Angela Merkel at an event in Berlin, said the pair were “heartbroken”, while Trump told fellow NATO leaders the attack was “savage” and “barbaric”. 
 
 Many European cities, including Paris, Berlin and Brussels, have suffered attacks in the past two years, underlining the importance of confidential intelligence cooperation. 
 
 Britain routinely shares intelligence with the United States bilaterally, and as part of the “Five Eyes” network which also includes Australia, Canada and New Zealand. 
 
 Trump was widely criticized this month after it emerged he had discussed sensitive Syria-related intelligence, originating from an ally, with Russian officials at a White House meeting. May said at the time Britain would continue to share information with Washington. 
 
 Pictures published by the New York Times included remains of the bomb and of the rucksack carried by the suicide bomber, and showed blood stains amid the wreckage. 
 
 “I think it’s pretty disgusting,” said Scott Lightfoot, a Manchester resident, speaking outside a train station in the city. He criticized media for publishing such material. 
 
 Slideshow (8 Images) 
 
 “Who’s leaking it? Where’s it coming from? This is British intelligence at the end of the day, people shouldn’t be finding out about this.” 
 
 In a statement, the New York Times defended its decision to publish the images, saying they were “neither graphic nor disrespectful of victims”. 
 
 “Our coverage of Monday’s horrific attack has been both comprehensive and responsible,” the newspaper said. ||||| A "vivacious" teenager from the picturesque Scottish island of Barra has been confirmed dead by her parents. 
 
 Eilidh MacLeod, 14, was killed in the blast at the Ariana Grande concert in Manchester on Monday evening, which she attended with her close friend Laura MacIntyre, 15, who was located in hospital nearly 20 hours after the incident. 
 
 Ms MacIntyre's parents have said in a statement that their daughter is in a critical condition. 
 
 They said: "Our daughter Laura is a funny and witty young girl who excels at everything she does. 
 
 "Laura and her friend Eilidh were so looking forward to the concert, but the night has now ended in a tragedy where Eilidh has now lost her life and Laura is in a critical condition. ||||| British police have stopped sharing evidence from the investigation into the terror network behind the Manchester bombing with the United States after a series of leaks left investigators and the government furious. 
 
 The ban is limited to the Manchester investigation only. British police believe the leaks are unprecedented in their scope, frequency and potential damage. 
 
 Downing Street was not behind the decision by Greater Manchester police to stop sharing information with US intelligence, a No 10 source said, stressing that it was important police were allowed to take independent decisions. 
 
 “This is an operational matter for police,” a No 10 spokesman said. The police and the Home Office refused to comment. The Guardian understands there is not a blanket ban on intelligence-sharing between the US and the UK. 
 
 Photographs of Manchester bomb parts published after leak Read more 
 
 Relations between the US and UK security services, normally extremely close, have been put under strain by the scale of the leaks from US officials to the American media. 
 
 After chairing a meeting of the emergency Cobra meeting Theresa May said: “I will make clear to President Trump that intelligence shared between our security agencies must remain secure.” She is due to meet the US president at a Nato summit in Brussels on Thursday. 
 
 Ahead of the summit, the prime minister said she would work with other leaders on the global effort to defeat terrorism and remove extremist material from the internet. 
 
 
 
 She said the domestic threat of terrorism is still at a critical level, meaning an attack may be imminent, and she urged the public to remain vigilant. 
 
 On Friday, the prime minister will attend a G7 summit in Taormina in Sicily, although her planned attendance is being cut short by a day because of the higher domestic terror threat level. 
 
 
 
 The prime minister said she will “lead a discussion on counter-terrorism and on how we will work together to prevent the plotting of terrorist attacks online and to stop the spread of hateful extremist ideology on social media”. 
 
 British officials were infuriated on Wednesday when the New York Times published forensic photographs of sophisticated bomb parts that UK authorities fear could complicate the expanding investigation, in which six further arrests have been made in the UK and two more in Libya. 
 
 It was the latest of a series of leaks to US journalists that appeared to come from inside the US intelligence community, passing on data that had been shared between the two countries as part of longstanding security cooperation. 
 
 A senior Whitehall source said: “These images from inside the American system are clearly distressing to victims, their families and other members of the public. Protests have been lodged at every relevant level between the British authorities and our US counterparts. They are in no doubt about our huge strength of feeling on this issue. It is unacceptable.” 
 
 Whitehall sources reported a sense of deflation among UK security staff at the amount of detail coming out of America. The UK had shared the material with US police and intelligence in the expectation it would remain secret. The amount released is hampering at least part of the investigation, they believe. 
 
 
 
 Manchester’s mayor, Andy Burnham, said the leaks were arrogant and disrespectful, and police chiefs also criticised the actions. 
 
 A national counter-terrorism policing spokesperson said: “We greatly value the important relationships we have with our trusted intelligence, law enforcement and security partners around the world. 
 
 “When that trust is breached it undermines these relationships, and undermines our investigations and 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 police and the domestic security agency, MI5, are facing questions over whether they ignored warnings about Salman Abedi and whether there were clues they failed to pick up on. 
 
 While not directly responding to the criticism, the agencies have stressed that they have a large number of potential suspects and, in spite of increased spending, do not have infinite resources to monitor everyone. Hard decisions have to be made about prioritising which suspects need to be put under physical and electronic surveillance, they have said. 
 
 The number of specialist personnel carrying out physical surveillance varies according to whether a suspect is being watched at home or in the outside world. 
 
 MI5 is reticent about releasing exact figures but it has a database of about 3,000 potential people of concern, of whom about 500 are regarded as potentially high risk. Only a small proportion of these can be put under 24-hour physical surveillance and often only for a limited number of days or weeks. 
 
 The ban on sharing information with the US on such a major inquiry is unprecedented, more so because the atrocity has potential implications for US efforts to prevent any similar attacks directed at American targets. 
 
 The ban is described as temporary, and British police are examining if they can put safeguards in place to stop any further leaks. 
 
 British police are angry that as their officers are in pursuit of a suspected terror network, with raids deemed so risky they are being carried out by elite armed officers, sensitive information is being regularly leaked by the US. 
 
 May will raise her concerns with the US president at the Nato summit, where she will push for the military alliance to join the coalition against Islamic State. 
 
 The images published by the New York Times revealed that the device used by Salman Abedi, which killed 22 people, had been made with “forethought and care”, raising questions for investigators about how it had been constructed and by whom. 
 
 Abedi had carried a metal box containing “well packed” explosives, metal nuts and screws in a box probably inside a Karrimor rucksack, the leaked details showed. The device was powerful enough for shrapnel to penetrate metal doors and to scar brick walls. Abedi detonated the bomb with his left hand. 
 
 It showed the force of the explosion was such that his torso was ripped from the rest of his body and propelled across the foyer and that most of those killed were in a circle around the bomber. 
 
 The kind of information that has been leaked is routinely shared with police counterparts in the US. The information goes into a shared computer system and is then distributed among different specialists in the US, ranging from bomb experts to those dealing in counter-terrorism. 
 
 The UK and US are among the closest intelligence partners in the world, with the UK’s surveillance agency, GCHQ, sharing information with the NSA, MI6 with the CIA, and MI5 with the FBI. But the lines are not rigid and information is often shared more widely. 
 
 On Wednesday Amber Rudd, the British home secretary, had rebuked the US security services for leaking the bomber’s name to American media before it had been made public in Britain, but her warnings appear to have had no impact. 
 
 “I have been very clear with our friends that that should not happen again,” Rudd said. 
 
 Nato’s secretary general, Jens Stoltenberg, was asked about the leaks by reporters in Brussels before Thursday’s meeting of Nato leaders. 
 
 He said: “Sharing intelligence is of great importance. Sharing intelligence is based on trust and we have seen in Nato over many, many years that we have been able to share intelligence in a good way and that has been of great importance to the alliance and for all allies.” 
 
 Stoltenberg said he was unable to comment further as he “did not know what actually happened”. He added that it was a bilateral issue between the US and the UK. 
 
 Ian Blair, who was Metropolitan police commissioner during the London underground bombings on 7 July 2005, said his investigation had also been troubled by leaks from US intelligence. 
 
 Blair said he was sure the leaks had “nothing to do with Trump” given that similar leaks had happened during his own time investigating a terror attack. 
 
 “I’m afraid this reminds me exactly of what happened after 7/7, when the US published a complete picture of the way the bombs had been made up. We had the same protests. 
 
 “It’s a different world in how the US operates in the sense of how they publish things. And this is a very grievous breach but I’m afraid it’s the same as before.” 
 
 Lord Carlile, the former independent reviewer of terrorism legislation, described the leaks as “very unusual and irresponsible” and called for those responsible to be “called to account”. 
 
 He said: “Photos of the backpack after the event could be of utility to future bombmakers, for obvious reasons. Also, it damages decades of confidence between the UK and US services, the cohesion of the ‘Five Eyes’ group [the US, UK, Canada, Australia and New Zealand], and sharing of information with French, German and other security services. These leaks made yesterday a very bad day for national security in several countries, and those responsible should be called to account.” ||||| The bomber in the Manchester terrorist attack appeared to have carried a powerful explosive in a lightweight metal container concealed either within a black vest or a blue Karrimor backpack, and may have held a small switch in his left hand, according to preliminary information gathered by British authorities. 
 
 Remnants of backpack 
 
 The initial analysis of the bomb, based on evidence photographed and collected at the crime scene and distributed by British authorities, does not specify the size or type of explosive used in the bomb’s main charge but suggests an improvised device made with forethought and care. 
 
 Possible switch located in suspect’s left hand 
 
 Law enforcement images of metal nuts and screws propelled by the blast, and of damage nearby, show that the bomb’s makeshift shrapnel penetrated metal doors and left deep scuffs in brick walls. 
 
 Nuts and screws used as shrapnel 
 
 And the authorities’ review of the blast site shows that many of the fatalities occurred in a nearly complete circle around the bomber, Salman Abedi, whose upper torso was heaved outside the lethal ring toward the Manchester Arena entrance. 
 
 Manchester Arena Torso of bomber Box office Doors to arena Victims Foyer Approx. location of detonation Bridge to Victoria Station Manchester Arena Torso of bomber Box office Doors to arena Victims Foyer Approx. location of detonation Bridge to Victoria Station Manchester Arena Torso of bomber Box office Doors to arena Victims Foyer Approx. location of detonation Bridge to Victoria Station The New York Times 
 
 All of these are indicators of a powerful, high-velocity charge, and of a bomb in which its shrapnel was carefully and evenly packed. 
 
 The location of the bomber’s torso, and the apparent absence of fatalities in a line between the blast site and where his remains landed, was said by one explosive disposal technician who examined the images to indicate that the explosive charge was more likely in a backpack than in a vest, and propelled the bomber away from the blast. 
 
 Manchester Arena Exit Stage Exit Exit Parking Exit Blast area People seen running down these stairs in video. Victoria Station Train tracks Manchester Arena Exit Stage Exit Exit Exit Blast area Victoria Station Train tracks The New York Times 
 
 Certain details of the bomb further suggest a desire by a bomb-maker to reduce the risk of a dud. 
 
 The authorities found a mangled Yuasa 12-volt, 2.1 amp-hour lead acid battery at the scene, which is more powerful than batteries often seen in backpack bombs or suicide vests. The battery, used for emergency lighting and other applications, can be bought for about $20. 
 
 12-volt battery that was possible power source 
 
 A possible switch to initiate the explosion, carried in the bomber’s left hand, was also unusual in a suicide device, in that it appears to have contained a small circuit board soldered inside one end. 
 
 It is not clear from the law enforcement images if the object was a simple plunger switch, or included a timer or a receiver that could be operated remotely via radio signal – or some combination, or something else. 
 
 Such redundancy, if the object was the switch, could give the bomber or a cell more than one option for deploying the device, and suggest that the bomb was not as simple in design as many terrorist devices, which often are crude and prone to failure or haphazard effect. 
 
 One independent analyst of improvised explosive devices, Michael C.L. Johnson, suggested that the object might be an electronic cigarette and unrelated to the bomb’s detonation – an understandable case of investigators focusing on a crime-scene detail early in a case.
– Police in Britain, angered by repeated leaks of sensitive information, have decided to stop sharing information on the Manchester terrorist attack with American authorities. The decision came after photographs believed to show bomb debris appeared in a New York Times report, sources tell the BBC, which calls the step a "hugely significant" move that shows just how angry British authorities are about leaks that could hinder the investigation. Prime Minister Theresa May is expected to raise the issue with President Trump at a NATO meeting Thursday, though the leaks are believed to have come from US law enforcement agencies, not the White House. In other coverage: The Times report that infuriated British police has photos of the remains of a backpack and a battery found at the scene, along with detailed analysis of the blast site. Analysts say the bomb, powerful enough to embed shrapnel in metal walls, appears to have been made with "forethought and care." Two more men in Britain have been arrested in connection with the Monday night attack, bringing the number of people in custody to eight, including one woman, reports Reuters. Suicide bomber Salman Abedi's father and brother have been detained in Libya. British authorities say the leaking of information provided under a long-standing cooperation deal is unacceptable. "These images from inside the American system are clearly distressing to victims, their families, and other members of the public," a government source tells the Guardian. "Protests have been lodged at every relevant level between the British authorities and our US counterparts." Rep. Mike McCaul, chairman of the House Homeland Security Committee, says the device detonated at the end of an Ariana Grande concert shows a "level of sophistication" that suggests the involvement of foreign terror cells, the AP reports. "It looks like we're not dealing with a lone wolf situation. There's a network—a cell of ISIS-inspired terrorists," the Republican says. Sky News reports that German intelligence services say Abedi was in the country around four days before the Manchester attack. Security camera footage obtained by Sky shows a man suspected to be Abedi in Manchester's Arndale shopping center on Friday with what may be the backpack used in the bombing. One of the latest of the 22 victims to be identified is 14-year-old Eilidh MacLeod, who had traveled from the Scottish island of Barra to Manchester with her mother and a friend for the concert, the Telegraph reports. "Eilidh was vivacious and full of fun. She loved all music, whether it was listening to Ariana or playing the bagpipes with her pipe band," her family said in a statement.