Don't miss a thing by getting the day's biggest stories sent direct to your inbox Reviewing the CCTV footage at Manchester Arena was 'the best way to try and find out what had happened and who was responsible' in the immediate aftermath of the bomb attack, a former police chief said.
Andrea Graham, then a chief inspector, arrived at the venue almost an hour and a half after the atrocity on May 22, 2017. Suicide bomber Salman Abedi detonated a bomb filled with shrapnel at 10.31pm, murdering 22 people and injuring more than 100, after a concert by US star Ariana Grande.
Mrs Graham was the most senior British Transport Police officer until a superintendent arrived from Blackpool hours later at 1.23am.
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