CRI听力:Probe into Chopper Crash in Argentina

An investigation is underway in Argentina into a mid-air helicopter collision that killed ten people on Tuesday, which included three French sports stars taking part in a reality TV show.

Two helicopters collided during the filming of the show called "Dropped."

The program sees contestants left in the wilderness to fend their way back to civilization.

Others killed include five producers of the program and the two Argentine pilots.

The three sports celebrities are Yachtswoman Florence Arthaud, Olympic swimmer Camille Muffat and Olympic boxer Alexis Vastine.

25-year-old Muffat was a gold medalist at the London Olympics while 28-year-old Vastine won bronze at the Beijing Games.

French President Francois Hollande.

"Obviously my thoughts today are with these three champions who made their country shine but unfortunately have died because they wanted to push their limits. "

Argentine authorities say it is still unclear what caused the helicopters to collide.

Weather is not believed to have been a factor.

It's believed the crews were filming at the time of the crash.