On 22 May 2017, a shrapnel-laden homemade bomb was detonated by an Islamist extremist suicide bomber as people were leaving the Manchester Arena following a concert by Ariana Grande.  In addition to the attacker, twenty two people died and 139 were wounded; children accounting for more than half of the total number. Shared responsibility of security for the venue and immediate surrounding area involved both public and private sector organisations who bore particular responsibilities within the