Ariana Grande concert explosion

Queen Elizabeth II speaks to Amy Barlow, 12, from Rawtenstall, Lancashire, and her mother, Kathy during a visit to the Royal Manchester Children’s Hospital on May 25, 2017, to meet victims of the terror attack and to thank members of staff who treated them. (Peter Byrne / Getty Images)

Queen Elizabeth II meets medical staff during a visit to the Royal Manchester Children’s Hospital on May 25, 2017. The queen visited the hospital to meet victims of the Manchester Arena terror attack and to thank members of staff who treated them. (Peter Byrne / Getty Images)

Britain’s Prime Minister Theresa May leaves 10 Downing Street in central London on May 25, 2017. May said she would raise the issue of leaks from a probe into the Manchester terror attack that have infuriated British authorities with their U.S. counterparts ahead of her departure for a NATO summit in Brussels. (Daniel Leal-Olivas / AFP/Getty Images)

A British Army soldier on guard next to an armed police officer by the Houses of Parliament of in London on May 25, 2017. (Facundo Arrizabalaga / EPA)

Armed police patrol the streets of Manchester on May 25, 2017. (Nigel Roddis / EPA)

Police seal off Lindy Road in Manchester as the attack investigation continues on May 25, 2017. (Christopher Furlong / Getty Images)

Residents of Lindum Street in Manchester observe a nationwide minute of silence while holding the jerseys of both famed Manchester soccer teams, Manchester City and Manchester United, in memory of the victims of the bomb attack on May 25, 2017. (Christopher Furlong / Getty Images)

People pay their respects to the victims of the Manchester bombing with a nationwide minute of silence in St. Ann’s Square on May 25, 2017. (Nigel Roddis / EPA)

People pay their respects to the victims of the Manchester bombing with a nationwide minute of silence in St. Ann’s Square on May 25, 2017. (Jeff J Mitchell / Getty Images)

Members of the Manchester Dawoodi Bohra Muslim community pay their respects to victims of the Manchester Arena attack in St. Ann’s Square on May 24, 2017. (Christopher Furlong / Getty Images)

People embrace in St. Ann’s Square during a vigil for the Manchester Arena attack victims on May 24, 2017. (Christopher Furlong / Getty Images)

Pink balloons are released into the sky above tributes in St. Ann’s Square on May 24, 2017, in Manchester. (Christopher Furlong / Getty Images)

Peolple bring flowers to St. Ann’s Square in Manchester, where a carpet of tributes has been laid on May 24, 2017. (Christopher Furlong / Getty Images)

A man pauses as he looks at floral tributes and messages in St. Ann’s Square on May 24, 2017, in Manchester, England. (Christopher Furlong / Getty Images)

Manchester resident Gulnar Bano Kham Ghadri wears a British flag headscarf during a vigil by multicultural religious leaders in St. Ann’s Square on May 24, 2017. (Jeff J. Mitchell / Getty Images)

Manchester United players pause for a minute’s silence May 24, 2017, as a tribute to the victims of the Manchester bombing, before the UEFA Europa League final against Ajax Amsterdam at the Friends Arena in Stockholm. (Martin Meissner / AP)

Police officers work at a residential property on Elsmore Road in Manchester, England, on May 24, 2017, continuing their investigation into the terror attack at the Manchester Arena. (Joe Giddens / AP)

Police officers work at a residential property on Elsmore Road in Manchester, England, on May 24, 2017, continuing their investigation into the terror attack at the Manchester Arena. (Oli Scarff / AFP/Getty Images)

Scottish First Minister Nicola Sturgeon meets with police authorities on May 24, 2017, in Glasgow. Security measures across the United Kingdom have been stepped up after the nation’s terror threat level was raised to “critical” in the wake of the Manchester bombing. (Robert Perry / Getty Images)

British Army soldiers along with armed police patrol the streets in London on May 24, 2017. Britain is on critical alert following the Manchester terror attack that killed 22 people. (Facundo Arrizabalaga / EPA)

People pause to look at floral tributes and messages in St. Ann Square on May 24, 2017, in Manchester, England. (Jeff J Mitchell / Getty Images)

British Army soldiers patrol along Whitehall near Downing Street and the Houses of Parliament in central London on May 24, 2017. (Justin Tallis / AFP Getty Images)

People have their bags searched outside St Paul’s Cathedral in London on May 24, 2017, ahead of a service to mark the 100th anniversary of the Order of the British Empire. Amed troops were at vital locations after the official threat level was raised following a suicide bombing in Manchester that killed 22 people. (Tim Ireland / AP)

Tributes lie in St. Ann’s Square on May 24, 2017, for the people who lost their lives in the Manchester Arena terror attack. Britain is on critical alert following the apparent suicide bombing. (Andy Rain / EPA)

Newspapers reporting about the suicide attack at a concert by Ariana Grande that killed more than 20 people are placed in central Manchester on May 24, 2017. (Emilio Morenatti / Associated Press)

Manchester City Council workers move the floral tributes from Albert Square to St. Ann’s Square on May 24, 2017, in Manchester, England. (Jeff J Mitchell / Getty Images)

Police patrol May 24, 2017, near Victoria Station in Manchester, England. Armed troops were at vital locations after the official threat level was raised to its highest point following a suicide bombing that killed 22 people. (Kirsty Wigglesworth / AP)

People pause to look at floral tributes and messages in St. Ann’s Square on May 24, 2017, in Manchester, England. (Jeff J Mitchell / Getty Images)

People have their bags searched outside St. Paul’s Cathedral in London on May 24, 2017, ahead of a service to mark the 100th anniversary of the Order of the British Empire. Armed troops were at vital locations after the official threat level was raised to its highest point following a suicide bombing that killed 22 people. (Tim Ireland / AP)

A woman stands May 24, 2017, near a memorial for the victims of the terror attack in Manchester, England. (Emilio Morenatti / AP)

Police officers patrol outside St. Paul’s Cathedral in London on May 24, 2017. Armed troops were at vital locations after the official threat level was raised to its highest point following a suicide bombing that killed 22 people. (Tim Ireland / AP)

People lay flowers after a vigil in Manchester, England, on May 23, 2017, the day after a suicide attack at an Ariana Grande concert left 22 people dead. (Kirsty Wigglesworth / AP)

A woman is consoled as she looks at the floral tributes after an evening vigil outside the Town Hall on May 23, 2017, in Manchester, England. An explosion occurred at Manchester Arena as concertgoers were leaving an Ariana Grande performance. (Leon Neal / Getty Images)

The lights are off at the ancient Colosseum in Rome on May 23, 2017, in tribute to the victims of the terrorist attack in Manchester, England. (Angelo Carconi / AP)

A woman lights candles after a vigil in Manchester, England, on May 23, 2017, the day after a suicide attack at an Ariana Grande concert that left 22 people dead. (Emilio Morenatti / AP)

People cry after a vigil in Albert Square in Manchester, England, on May 23, 2017, the day after a suicide attack at an Ariana Grande concert that left 22 people dead. (Emilio Morenatti / AP)

A British flag is seen next to flowers after a vigil in Albert Square in Manchester, England, on May 23, 2017, the day after a suicide attack at an Ariana Grande concert left 22 people dead. (Emilio Morenatti / AP)

Visitors look at floral tributes after an evening vigil outside Town Hall on May 23, 2017, in Manchester, England. An explosion occurred at Manchester Arena as concertgoers were leaving an Ariana Grande performance. (Leon Neal / Getty Images)

People lay tributes at a on May 23, 2017, vigil in Manchester, England. for those who died in the terrorist attack a day earlier. (Andy Rain / EPA)

Mourners attend a candlelight vigil on May 23, 2017, to honor the victims of the terrorist attack a day earlier at Manchester Arena in England. (Jeff J Mitchell / Getty Images)

Messages and floral tributes are seen in Albert Square in Manchester, England, on May 23, 2017, in solidarity with those killed and injured in the previous day’s terror attack at an Ariana Grande concert. (Ben Stansall / AFP/Getty Images)

People attend a vigil in Trafalgar Square in London on May 23, 2017, for the victims of an attack that killed 22 people at a concert in Manchester the previous day. (Victoria Jones / AP)

Police officers on May 23, 2017, add to the flowers for the victims of the previous night’s explosion at an Ariana Grande concert in Manchester, England. (Martin Rickett / AP)

A woman and a young girl, who is wearing a T-shirt of singer Ariana Grande, talk to police May 23, 2017, near Manchester Arena in Manchester, England the day after an explosion at a concert by Grande killed 22 people. (Oli Scarff / AFP/Getty Images)

A woman pauses at a memorial in St. Ann Square on May 23, 2017, in Manchester, England, a day after 22 people were killed in a suicide bombing at a pop concert packed with children. It was the worst terror incident on British soil since the London bombings of 2005. (Jeff J Mitchell / Getty Images)

A woman makes her way to lay flowers in St. Ann Square in Manchester, England, on May 23, 2017, to honor the victims of the previous night’s terror attack. (Jeff J Mitchell / Getty Images)

Floral tributes are left in St. Ann’s Square in Manchester, England, on May 23, 2017, for those killed and injured in a terror attack at the Ariana Grande concert the previous night. (Ben Stansall / AFP/Getty Images)

A fan is comforted as she leaves a hotel in Manchester, England, on May 23, 2017, the day after an apparent suicide bomber attacked an Ariana Grande concert, killing 22 people. (Rui Vieira / AP)

British Prime Minister Theresa May meets Chief Constable of Greater Manchester Police Ian Hopkins on May 23, 2017, in Manchester, the day after a terrorist attack in the city. (Leon Neal / Getty Images)

Retail staff hug each other after being evacuated from the Arndale Centre shopping mall in Manchester, England, on May 23, 2017, following a security alert the day after a deadly terror attack at the Manchester Arena. (Ben Stansall / AFP/Getty Images)

A fan leaves a hotel with her parents May 23, 2017, in Manchester, England, a day after a suicide bomber attacked at an Ariana Grande concert at Manchester Arena. (Rui Vieira / AP)

A police officer with a sniffer dog patrols near the Manchester Arena in Manchester, England, on May 23, 2017. An explosion struck an Ariana Grande concert attended by thousands of young music fans the previous night, killing 22 people. (Danny Lawson / AP)

Police block a road near to the Manchester Arena in Manchester, England, on May 23, 2017. An explosion struck an Ariana Grande concert attended by thousands of young music fans the previous night. (Rui Vieira / AP)

Police forensic officers on May 23, 2017, walk along a bridge linking Victoria station to the Manchester Arena, scene of a terror attack during a pop concert by singer Ariana Grande. (Paul Ellis / AFP/Getty Images)

Police stand guard at dawn, after a blast at the Manchester Arena on May 23, 2017. (Peter Byrne / AP)

People receive treatment from emergency service staff at Victoria Railway Station close to the Manchester Arena on May 23, 2017, in Manchester, England. (Dave Thompson / Getty)

Police escort members of the public from the Manchester Arena on May 23, 2017, in Manchester, England. (Christopher Furlong / Getty Images)

Armed police work at Manchester Arena after reports of an explosion at the venue during an Ariana Grande gig in Manchester, England Monday, May 22, 2017. Several people have died following reports of an explosion Monday night at an Ariana Grande concert in northern England, police said. A representative said the singer was not injured. (Peter Byrne / AP)

Armed police respond after reports of an explosion at Manchester Arena during an Ariana Grande concert in Manchester, England, Monday, May 22, 2017. Several people have died following reports of an explosion Monday night at the concert in northern England, police said. A representative said the singer was not injured. (Peter Byrne / AP)

Armed police work after an explosion at the Manchester Arena in Manchester, England Tuesday, May 23, 2017. An explosion struck an Ariana Grande concert attended by thousands of young music fans in northern England late Monday, killing over a dozen people and injuring dozens in what police said Tuesday was being treated as a terrorist attack. (Peter Byrne / AP)

Police stand by a cordoned-off street close to the Manchester Arena on May 22, 2017, in Manchester, England, after an explosion at an Ariana Grande concert. (Dave Thompson / Getty Images)

Emergency services personnel speak to people outside Manchester Arena in England after reports of an explosion at the venue May 22, 2017. (Peter Byrne / AP)

Police work at Manchester Arena after reports of an explosion at the venue during an Ariana Grande gig in Manchester, England Monday, May 22, 2017. Several people have died following reports of an explosion Monday night at an Ariana Grande concert in northern England, police said. A representative said the singer was not injured. (Peter Byrne / AP)

Police stand guard at Manchester Arena after reports of an explosion at the venue during an Ariana Grande gig in Manchester, England, on May 22, 2017. (Peter Byrne / AP)

Police gather at Manchester Arena after reports of an explosion at the venue during an Ariana Grande gig in Manchester, England, on May 22, 2017. At least 19 people were killed. (Peter Byrne / AP)