Twenty-two people, including children, are now known to have been killed and 59 injured in a suspected terror attack at Manchester Arena during a performance by Ariana Grande on Monday.
The blast happened at 22:35 BST.
Greater Manchester Police said the lone male attacker, who died in the blast, was carrying an improvised explosive device which he detonated.
Relatives are using social media to hunt for missing loved ones.
Home Secretary Amber Rudd said it was “a barbaric attack, deliberately targeting some of the most vulnerable”.