MI5 missed significant opportunity to prevent Manchester Arena attack, finds inquiry

 The security service MI5 missed a significant chance to take action that might have prevented the Manchester Arena attack, an inquiry has found. 

Chairman Sir John Saunders said the reasons for the missed opportunity included a "failure" by an MI5 officer to act swiftly enough.  Twenty-two people were killed when Salman Abedi detonated a homemade bomb after a concert on 22 May 2017.