The Metropolitan Police said they were treating as a “terrorist incident” the stabbing of a police officer at the Houses of Parliament in London on March 22.Nearby, on Westminster Bridge, a car knocked down and injured several people.Video uploaded to Twitter showed people on the bridge being helped up by other members of the public, as well as an air ambulance landing at Parliament Square.This video, from Brexit Central journalist David Scullion, shows people rushing out of parliament.