Emergency services 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/PA via AP)
© Peter Byrne/PA via AP MANCHESTER, ENGLAND - MAY 23: Police and fans close to the Manchester Arena on May 23, 2017 in Manchester, England. An explosion occurred at Manchester Arena as concert goers were leaving the venue after Ariana Grande had performed. Greater Manchester Police have confirmed 19 fatalities and at least 50 injured. (Photo by Dave Thompson/Getty Images)
© Dave Thompson/Getty Images Armed police stand guard at Manchester Arena after reports of an explosion at the venue during an Ariana Grande gig in Manchester, England Monday, May 22, 2017. Police says there are "a number of fatalities" after reports of an explosion at an Ariana Grande concert in northern England. (Peter Byrne/PA via AP)
© Peter Byrne/PA via AP MANCHESTER, ENGLAND - MAY 23: Police close to the Manchester Arena on May 23, 2017 in Manchester, England. An explosion occurred at Manchester Arena as concert goers were leaving the venue after Ariana Grande had performed. Greater Manchester Police have confirmed 19 fatalities and at least 50 injured. (Photo by Dave Thompson/Getty Images)
© Dave Thompson/Getty Images MANCHESTER, ENGLAND - MAY 23: Police escort members of the public from the Manchester Arena on May 23, 2017 in Manchester, England. An explosion occurred at Manchester Arena as concert goers were leaving the venue after Ariana Grande had performed. Greater Manchester Police have confirmed 19 fatalities and at least 50 injured. (Photo by Christopher Furlong/Getty Images)
© Christopher Furlong/Getty Images MANCHESTER, ENGLAND - MAY 23: Police escort members of the public from the Manchester Arena on May 23, 2017 in Manchester, England. An explosion occurred at Manchester Arena as concert goers were leaving the venue after Ariana Grande had performed. Greater Manchester Police have confirmed 19 fatalities and at least 50 injured. (Photo by Christopher Furlong/Getty Images)
© 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/PA via AP)
© Peter Byrne/PA via AP Emergency services 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/PA via AP)
© Peter Byrne/PA via AP epaselect epa05982570 A woman sits in the street in a blanket near the Manchester Arena as police guard the area following reports of an explosion, in Manchester, Britain, 23 May 2017. According to a statement released by the Greater Manchester Police on 23 May 2017, police responded to reports of an explosion at Manchester Arena on 22 May 2017 evening. At least 19 people have been confirmed dead and others 50 were injured, authorities said. The happening is currently treated as a terrorist incident until police know otherwise. According to reports quoting witnesses, a mass evacuation was prompted after explosions were heard at the end of US singer Ariana Grande's concert in the arena. EPA/NIGEL RODDIS
© EPA/NIGEL RODDIS MANCHESTER, ENGLAND - MAY 23: A man is stretchered out of Manchester Arena on May 23, 2017 in Manchester, England. An explosion occurred at Manchester Arena as concert goers were leaving the venue after Ariana Grande had performed. Greater Manchester Police have confirmed 19 fatalities and at least 50 injured. (Photo by Christopher Furlong/Getty Images)
© Christopher Furlong/Getty Images epa05982575 Armed officers guard outside a hotel near the Manchester Arena following reports of an explosion, in Manchester, Britain, 23 May 2017. According to a statement released by the Greater Manchester Police on 23 May 2017, police responded to reports of an explosion at Manchester Arena on 22 May 2017 evening. At least 19 people have been confirmed dead and others 50 were injured, authorities said. The happening is currently treated as a terrorist incident until police know otherwise. According to reports quoting witnesses, a mass evacuation was prompted after explosions were heard at the end of US singer Ariana Grande's concert in the arena. EPA/NIGEL RODDIS
© EPA/NIGEL RODDIS 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 Photo/Rui Vieira)
© AP Photo/Rui Vieira MANCHESTER, ENGLAND - MAY 23: A police officer guards the scene near Manchester Arena on May 23, 2017 in Manchester, England. An explosion occurred at Manchester Arena as concert goers were leaving the venue after Ariana Grande had performed. Greater Manchester Police have confirmed 19 fatalities and at least 50 injured. (Photo by Christopher Furlong/Getty Images)
© Christopher Furlong/Getty Images ANCHESTER, ENGLAND - MAY 23: Dawn breaks over Manchester Arena on May 23, 2017 in Manchester, England. An explosion occurred at Manchester Arena as concert goers were leaving the venue after Ariana Grande had performed. Greater Manchester Police have confirmed 19 fatalities and at least 50 injured. (Photo by Christopher Furlong/Getty Images)
© Christopher Furlong/Getty Images A police officer with a sniffer dog patrols near 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. (Danny Lawson/PA via AP)
© Danny Lawson/PA via AP MANCHESTER, ENGLAND - MAY 23: Police forensic officers leave the Manchester Arena as they investigate the scene of an explosion on May 23, 2017 in Manchester, England. An explosion occurred at Manchester Arena as concert goers were leaving the venue after Ariana Grande had performed. Greater Manchester Police are treating the explosion as a terrorist attack and have confirmed 22 fatalities and 59 injured. (Photo by Dave Thompson/Getty Images)
© Dave Thompson/Getty Images Police block a road near to the Manchester Arena in central 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. (AP Photo/Rui Vieira)
© AP Photo/Rui Vieira Members of the public make their way to work on May 23, 2017 in Manchester, England. An explosion occurred at Manchester Arena as concert goers were leaving the venue after Ariana Grande had performed. Greater Manchester Police are treating the explosion as a terrorist attack and have confirmed 22 fatalities and 59 injured. (Photo by Dave Thompson/Getty Images)
© Dave Thompson/Getty Images