Ariana Grande concert blast: Photos show panic at Manchester Arena

A barefoot concertgoer, center, on a phone outside Manchester Arena where Ariana Grande had performed. (REUTERS/Jon Super)

Two women wrapped in thermal blankets stand near Manchester Arena. (REUTERS/Andrew Yates)

Armed police respond to the reports of an explosion at Manchester Arena during the Ariana Grande concert. (Peter Byrne/PA via AP)

An ambulance drives away from Manchester Arena, where Ariana Grande had been performing, in Manchester. (REUTERS/Andrew Yates)

People react at Manchester Arena after reports of the explosion at the venue during the Ariana Grande concert. (Peter Byrne/PA via AP)

People sit by the side of the road next to police tape outside Manchester Arena. (REUTERS/Andrew Yates)

A police van and an ambulance outside Manchester Arena. (REUTERS/Jon Super)

Emergency services personnel speak to people outside Manchester Arena after reports of the explosion at the venue during the Ariana Grande concert. (Peter Byrne/PA via AP)

Armed police gather at Manchester Arena after reports of the explosion at the venue during the Ariana Grande concert. (Peter Byrne/PA via AP)

Armed police officers stand next to police tape outside Manchester Arena. (REUTERS/Andrew Yates)