Three people and a terrorist are dead after an attacker brought carnage to central London today, mowing down pedestrians on Westminster Bridge and hacking at police with knives in the grounds of the Houses of Parliament.
Around 20 people were hit when a 4x4 drove along the pavement on the crowded bridge, knocking down and seriously injuring pedestrians before crashing into a fence below Big Ben.
The killer, described by witnesses as 'middle-aged and Asian', then managed to break into the grounds of Parliament, where he fatally stabbed a police officer with two knives.
The policeman died at the scene. The attacker - who was shot at least twice by armed officers guarding the building - died after he was taken to hospital.