<p>A 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 incident</a>.</p><p>The 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 Twitter</a> showed people on the bridge being helped up by other members of the public.</p><p>These videos show police presence in Parliament Square and a helicopter landing on the green.</p><br />
