UPDATE 10-France mourns sports stars killed in Argentina helicopter crash
* Olympic swimmer, boxer and sailor among the dead
* "French sport in mourning", says minister
* Second tragedy in 2 years for a TF1 reality show (Adds new quote from French president, French investigation, and comment by father of swimmer Muffat)
By Eliana Raszewski and Mark John
BUENOS AIRES/PARIS, March 10 (Reuters) - France mourned on Tuesday the deaths of three sports stars who were among 10 people killed when two helicopters collided in a remote region of Argentina during the filming of a reality TV show.
Investigators removed the bodies of Olympic swimmer Camille Muffat, yachtswoman Florence Arthaud and boxer Alexis Vastine from the charred wreckage of the two aircraft, but said it was still unclear what caused the accident on Monday afternoon in the rugged western province of La Rioja. There were no survivors.
Amateur footage taken from the ground showed the two helicopters flying in tandem at low altitude when one appears to deviate into the path of the other. Both helicopters then plunge to the ground.
A second video showed dozens of people rushing through the heavy undergrowth toward the helicopters' burning wreckage. The accident occurred around 5.15 p.m. local time (2015 GMT).
French President Francois Hollande paid tribute to the athletes he said had "made France shine". Continuación...