Greater Manchester mayor Andy Burnham has said the families of the Manchester Arena attack victims must be given answers about how the suicide bomber's brother was able to attack prison guards.On Saturday,

Martin Hibbert, who suffered life-changing injuries along with his daughter Eve, at the Ariana Grande concert, said in an open letter: “Let’s call this what it is: a catastrophic failure of your duty to protect prison staff and the public from an unrepentant terrorist.

Martin Hibbert wrote to Justice Secretary Shabana Mahmood saying Hashem Abedi’s attack on prison guards was a ‘catastrophic failure’ of duty.