Eyewitness describes horrific scenes on Westminster Bridge

The Houses of Parliament has been locked down while the two men were being treated inside the grounds. Eye-witnesses aid at least one of the men was receiving CPR. Pictures from the scene appeared to show a car crashed into railings outside the building just before 3pm. George Eaton tweeted: "Police have just shot a man who was attacking officers at parliament's entrance." It is thought at least five people were injured on Westminster Bridge after apparently being hit by a car. Speaker John Bercow closed Parliament in the wake of the incident.