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Natacha Pisarenko, Associated Press
A man covers with a plastic tarp the bodies of those killed after two helicopters crashed near Villa Castelli, La Rioja province, Argentina, Tuesday, March 10, 2015. Investigators have recovered the bodies from the remote site in northwest Argentina where the two helicopters collided in midair, killing 10 people, including two former French Olympians in a tragedy that shook France and brought renewed scrutiny of the dangers while filming reality shows.

VILLA CASTELLI, Argentina — Investigators on Tuesday recovered all 10 bodies from a remote site in Argentina where helicopters serving a reality TV show collided, killing prominent French athletes and leaving the European nation in mourning.

The helicopters crashed Monday afternoon near Villa Castelli, about 730 miles (1,170 kilometers) northwest of Buenos Aires, said La Rioja regional Secretary of Security Cesar Angulo. All aboard — eight French nationals and two Argentine pilots — were killed.

The helicopters came down about 50 feet (15 meters) apart and were completely destroyed. One of the aircraft was so charred that only the blades were recognizable.

Among the dead were Olympic champion swimmer Camille Muffat, Olympic boxer and bronze-medalist Alexis Vastine, and pioneering sailor Florence Arthaud. They had been among the contestants in the reality TV show "Dropped."

The bodies were being transported to the regional capital of La Rioja province, where autopsies would be conducted, Judge Virginia Illanes Bordon told The Associated Press. Illanes Bordon said the rough terrain made recovering the bodies late Monday impossible.

At the site, which had been cordoned off, investigators pulled cellphones, papers and other charred, unrecognizable items from the wreckage in dry scrubland of a sparsely populated area along the Andes mountain range that separates Argentina and Chile.

The crash was believed to be one the deadliest incidents yet related to reality TV shows, a sub-genre of which involves taking celebrities and others to far-flung places to face challenges both physical and mental.

French President Francois Hollande expressed "immense sadness" over the deaths, and the Paris prosecutor's office opened an investigation into possible involuntary manslaughter, which is to be conducted by a research unit of the French air transport police, a French police official said.

The remaining victims were identified as Laurent Sbasnik, Lucie Mei-Dalby, Volodia Guinard, Brice Guilbert and Edouard Gilles, as well as pilots Juan Carlos Castillo and Roberto Abate.

The wife of Castillo, Cristina Alvarez, told television station Todo Noticias that her husband was a veteran of the Falklands War and had vast experience flying helicopters, including in places like Antarctica and the Falkland Islands.

Her voice cracking, she said her husband was "extremely happy" because he had recently found out he was going to be a grandfather.

Angulo, the security secretary, said one of the helicopters belonged to La Rioja province and the other to neighboring Santiago del Estero province.

"The helicopter from La Rioja was a Eurocopter with a capacity to hold six people. It appears to have brushed against the other helicopter from Santiago del Estero shortly after takeoff," the statement from the provincial government said.

A widely circulated video purportedly shot at the scene shows the blades of one helicopter hitting the rails of the second, causing both aircraft to lose control and crash.

Luis Solorza, press secretary for La Rioja province, told the AP he didn't know who shot the video but that authorities believed it was authentic and investigators were using it as part of their probe.

Solorza said renting out La Rioja's lone helicopter, for the reality show or during the Dakar rally, brought much-needed income into the province.

"To promote tourism, we lend out the helicopter," said Solorza, adding that the province had declared two days of mourning.

The crew had arrived Sunday in Villa Castelli, where it had previously filmed a version of "Dropped" for Switzerland and Denmark, said Mayor Andres Navarrete.

French Secretary of State for Sport Thierry Braillard said on the BFM TV channel that "French sport has lost three stars this morning."

Vastine, 28, won a bronze medal at the 2008 Olympic Games in Beijing and lost in the quarterfinals four years later in London amid a sporting controversy that led him to break down in tears. He had reportedly vowed to win gold at the 2016 games in Rio.

Muffat, 25, won gold in the 400-meter freestyle in London, plus a silver medal in the 200-meter freestyle and a bronze in the 4 by 200-meter freestyle relay. She had since retired from swimming to focus on her personal life.

But perhaps the best known was Arthaud, 57, a pioneer in sailing. In 1990, she became the first woman to win the famed Route du Rhum race, a trans-Atlantic single-handed yacht race between Brittany and the Caribbean island of Guadeloupe.

Other "Dropped" contestants on hand included former France and Arsenal striker Sylvain Wiltord, ice skating champion Philippe Candeloro, former Olympic swimming champion Alain Bernard and veteran cyclist Jeannie Longo. None of them was involved in the accident.

"I am sad for my friends, I'm trembling, I'm horrified, I don't have words. I can't say anything," Wiltord tweeted.

Candeloro, speaking on RTL radio, said the other contestants were at their hotel Tuesday awaiting arrival of French consular officials.

The deaths were likely to place new attention on risks involved with such shows. Two years ago, TF1 — France's leading private-sector network, which aired the program — canceled the season of the "Survivor"-like show "Koh Lanta" after a 25-year-old participant died of a heart attack on the first day of filming in Cambodia.

Show producer Adventure Line Productions was behind both programs. In a statement, the company said its staffers were "devastated" and "share the deep pain of the families and loved ones."

Reality TV shows can appeal to former adrenaline-powered star athletes who remain famous and beloved long after their careers are over, and are looking for new challenges or fun.

William Forgues, Muffat's companion, told i-Tele cable news channel that she was instructed not to reveal details about the show filming, but "told everybody that it was great. She was not forced (to do things). She was where she wanted to be."

"C'est la vie," he added.

Associated Press reporters Peter Prengaman, Victor Caivano and Almudena Calatrava contributed from Buenos Aires. Jamey Keaton and Jerome Pugmire reported from Paris.