A view of the charred wreckage of the two helicopters which collided in the region of Villa Castelli, in the Argentine province of La Rioja March 10, 2015.Reuters 
Investigators work next to the charred wreckage of the two helicopters which collided in the region of Villa Castelli, in the Argentine province of La Rioja on 10 March 2015.Reuters 
The charred wreckage of the two helicopters which collided is seen in the region of Villa Castelli, in the Argentine province of La Rioja March 10, 2015.Reuters 
Investigators work next to the charred wreckage of the two helicopters which collided in the region of Villa Castelli, in the Argentine province of La Rioja.Reuters 
Olympic boxer Alexis Vastine, long-distance sailor Florence Arthaud, and French swimmer and Olympic gold medallist Camille Muffat.Reuters
A video clip purportedly showing the exact moment the two helicopters carrying stars of reality TV show "Dropped" crashed has emerged online, hours after the fatal crash killed 10 people, including French Olympic sports stars.
The video clip, released by Argentina's El Sol website, shows the two helicopters flying alongside before moving precariously close to each other and ultimately crashing mid-air.
French swimmer and Olympic gold medallist Camille Muffat, Olympic boxer Alexis Vastine and long-distance sailor Florence Arthaud were among those killed when the helicopters collided mid-air.
The website also published a second clip in which people are seen running towards the site of the crash as the helicopters lay engulfed in flames and smoke.
Locals who witnessed the accident described it as a dramatic collision that resulted in a "ball of flame."
"One of the helicopters sounded as if it was firing off shots or experiencing small explosions that were completely out of place. There were about five metres between the two of them, but the one in front seemed to stop and that caught my attention," David Ocampo, a cattle farmer, was quoted as saying by Daily Mail.
"The other one smashed into it from behind with its propellor after trying to swerve to avoid it and fell to the ground and exploded. The earth shook when they fell. I rushed towards it to see if there were any survivors but it was just a ball of flame," he said.
The French sportspersons were part of a survival adventure TV show "Dropped" and were filming when the accident occurred in the Latin nation's north-west La Rioja province.
French President Francois Hollande paid tributes to the eight French nationals who were killed in the freak accident.
