Manchester Arena attack: At least 22 dead, 59 injured as explosion rocks Ariana Grande’s concert. See photos.

Armed police gather at Manchester Arena after reports of an explosion at the venue during an Ariana Grande gig in Manchester, England Monday, May 22, 2017. Police said there were at least 22 dead after reports of an explosion at an Ariana Grande concert in northern England. (Source: AP) READ LIVE updates

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. (Source: AP) READ LIVE updates

Police vehicles and a police officer are seen outside the Manchester Arena, where U.S. singer Ariana Grande had been performing in Manchester, northern England, Britain May 22, 2017. (Source: REUTERS) READ LIVE updates

Two women wrapped in thermal blankets stand near the Manchester Arena, where U.S. singer Ariana Grande had been performing, in Manchester, northern England, Britain, May 23, 2017. (Source: REUTERS) READ LIVE updates

People sit by the side of the road next to a police cordon outside the Manchester Arena, where U.S. singer Ariana Grande had been performing, in Manchester, northern England, Britain, May 23, 2017. (Source: REUTERS) READ LIVE updates

A police van and an ambulance are seen outside the Manchester Arena, where U.S. singer Ariana Grande had been performing, in Manchester, northern England, Britain May 22, 2017. (Source: REUTERS) READ LIVE updates

Still image from video shows people fleeing Manchester Arena in northern England where US singer Ariana Grande had been performing in Manchester, Britain, May 22, 2017. (Source: TWITTER.COM/HANNAWWH/via Reuters) READ LIVE updates

An ambulance drives away from the Manchester Arena, where U.S. singer Ariana Grande had been performing, in Manchester, northern England, Britain, May 23, 2017. (Source: REUTERS) READ LIVE updates

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. A representative said the singer was not injured. (Source: AP) READ LIVE updates

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 at least 22 people and injuring 59 in what police said Tuesday was being treated as a terrorist attack. (Source: AP) READ LIVE updates

Armed police work after an explosion at the Manchester Arena in Manchester, England Tuesday, May 23, 2017. (Source: AP) READ LIVE updates

The attack is likely the worst since the 2005 London bombing, that killed over 50 people including the perpetrators. (Source: AP) READ LIVE updates

Police officers stand next to their vehicles near the Manchester Arena after the blast. (Source: AP) READ LIVE updates

Still image taken from video shows a street scene near Manchester Arena after a blast, where U.S. singer Ariana Grande had been performing, in Manchester, Britain, May 22, 2017. (Source: Reuters) READ LIVE updates

A police officer with a sniffer dog patrols near the Manchester Arena where the blast took place. (Source: AP) READ LIVE updates

Greater Manchester Police Chief Constable Ian Hopkins speaks to the media in Manchester Tuesday May 23, 2017. (Source: AP) READ LIVE updates

Forensic police search the Manchester Arena in Manchester, Britain May 23, 2017. (Source: REUTERS) READ LIVE updates

Police stand guard at dawn, after a blast at the Manchester Arena Tuesday, May 23, 2017. (Source: AP) READ LIVE updates

Police block roads near to the Manchester Arena, seen at the right, in central Manchester, England Tuesday May 23, 2017. (Source: AP) READ LIVE updates

Commuters walk to work as a police cordon surrounds the Manchester Arena, Britain May 23, 2017. (Source: REUTERS) READ LIVE

Australian Parliamentarians stand for a minute of silence honouring the people killed and wounded in an explosion in the English city of Manchester, during Question Time in the House of Representatives at Parliament House in Canberra, Australia May 23, 2017. (Source: Reuters) READ LIVE updates

Helpers attend to injured people inside the Manchester Arena, Manchester, Britain, after a blast Monday, May 22, 2017. An apparent suicide bomber attacked an Ariana Grande concert as it ended Monday night, killing 22 people among a panicked crowd of young concertgoers. (Source: AP) READ LIVE updates

A fan is comforted as she leaves the Park Inn hotel in central Manchester, England Tuesday May 23. (Source: AP) READ LIVE updates

Fan leaves the Park Inn hotel in central Manchester, England, Tuesday, May 23. (Source: AP) READ LIVE updates

The British flag is hoisted at half-mast after the concert blast in Manchester at the British embassy in Berlin, Germany, Tuesday, May 23. (Source: AP) READ LIVE updates

Britain's Union Jack flag, the European Union flag and the Italian flag are at half mast outside the Chigi palace premier's office, in the wake of a deadly explosion in Mancherster, England, at an Ariana Grande concert, in Rome, Tuesday, May 23. (Source: AP) READ LIVE updates

Concert goers react after fleeing the Manchester Arena in northern England where U.S. singer Ariana Grande had been performing in Manchester. (Source: Reuters) READ LIVE updates

This image shows people running through Manchester Victoria station after an explosion at Manchester Arena. in Manchester England, Monday May 22. (Source: AP) READ LIVE updates

Union flags stand at half-mast on the roof of 10 Downing Street in London, Britain, May 23. (Source: Reuters) READ LIVE updates

A youngster wearing a t-shirt showing U.S. singer Ariana Grande talks to the media near the Manchester Arena in Manchester, Britain May 23. (Source: Reuters) READ LIVE updates