Footage has emerged of a police officer questioning two men after he stopped them on Thursday night on Westminster Bridge in London, UK.br br According to the filmer, they were "driving in a manner that alerted the police".br br "Due to recent events the officer took no chances," he added. br br On Wednesday, a man drove a car on the pavement on Westminster Bridge, killing four people and injuring 50, before he stabbed a police officer to death near Parliament.