pA police helicopter landed in Parliament Square in London on March 22, after reports that a car ran into several people on Westminster Bridge. A number of people were injured, reports said. Police said they are treating it as a terrorist incidenta.ppThe police tweeted that they were called at about 2:40 pm local time to reports of a security incident at Westminster Bridge. Video uploaded to Twittera showed people on the bridge being helped up by other members of the public.ppThese videos show police presence in Parliament Square and a helicopter landing on the green.