Buenos Aires: 10 people were killed after two helicopters crashed in North West Argentina during the filming of a television programme. According to authorities, the helicopters may have collided. Locals said that the passengers were French who were taking part in an international endurance and survival competition.Both the pilots were also killed in the incident. According to sources, one helicopter belonged to local provincial authorities.Among the them three Olympians have been found dead. They are London Olympic champion Camille Muffat, Sailon Champion Florence Arthaud and Olympian Boxer Alexis Vasting.