[Withano]

Police are understood to have recovered CCTV video of the bomber walking into Manchester Arena where he detonated a bomb. It shows the explosion was deliberate and caused by a suicide device, believed to be contained in a bag, a source said.

The device is described as homemade and crude. It was stable enough to be transported and explode with devastating effect and was believed to have been constructed in Britain.

The attacker had an identity document on him, sources said. The man named by police - Salman Abedi - was born to parents from Libya who came to Britain to flee the Gadaffi regime.

One senior security source described the attack involving the acquisition and construction of a bomb as “a game changer” that has “rocked us backwards”, because a successful bomb plot has not occurred in the UK since 2005.

Adding to that is uncertainty among investigators about whether Abedi built the bomb himself, or had help. GMP chief constable Ian Hopkins said: “The priority remains to establish whether he was acting alone or as part of a network.”

(Why would he have an identity document on him?)