(BBC) The head of MI5 said he was “profoundly sorry” the security service did not prevent the Manchester Arena attack.
A public inquiry found MI5 missed a significant chance to take action that might have stopped the 2017 bombing.
Chairman Sir John Saunders said the intelligence could have led to suicide bomber Salman Abedi being followed to a car where he stored his explosives.
MI5 director-general Ken McCallum said he regretted that such intelligence was not obtained.
“Gathering covert intelligence is difficult,” he said, “but had we managed to seize the slim chance we had, those impacted might not have experienced such appalling loss and trauma.”