A London Air Ambulance helicopter was filmed landing in Trafalgar Square, where a temporary landing zone had been set up in front of Nelson's Column. The striking video shows the bright red helicopter descending over the square before landing on a marked area. The air ambulance had been called to Covent Garden, where four men were stabbed in an incident on Endell Street. A London Ambulance Service spokesperson said: "We sent an ambulance crew, a paramedic in a fast response car and an incident response officer. "We also dispatched London’s Air Ambulance.