UK Police say the terror attack in London earlier this week was over in less than a minute and a half.
Khalid Masood took 82 seconds to drive into pedestrians on Westminster bridge, crash his car, then fatally stab an officer guarding the Houses Parliament.
He killed four people and dozens were injured.
Meanwhile the family of murdered PC Keith Palmer have thanked those who came to his aid, saying there was nothing more they could have done.
