Eight French citizens and two Argentines filming a popular European reality show, were killed in a crash involving two helicopters on Monday in northwest Argentina.

The dead also include three French sports personalities.

The crash occurred while the two helicopters were flying near Villa Castelli in La Rioja province, 1,170 kilometers northwest of Buenos Aries.

La Rioja police commissary Fabian Gordillo confirmed that two Argentine pilots and eight French citizens were onboard.

The pilots were identified as Juan Carlos Castillo and Roberto Abate. The French nationals were a part of the survivalist reality show "Dropped."

The team had arrived in Villa Castelli on Sunday, where it had previously filmed another version of the show for Denmark and Switerzland. The cause of the crash is still unknown. But the speculations are that an explosion occurred and helicopters collided.

Aeronautical experts are determining the actual cause of the crash. The two helicopters belonged to La Rioja province and Santiago del Estero province.