Four members of the Tignes Ski Patrol were on board at the time, along with the helicopter pilot and mechanic.
The ski patrol were due to reactivate the remote avalanche triggering devices above the town of Les Boisses when the helicopter crashed at the Roche du Marais early on Wednesday morning. It is thought that high winds caused it to roll to the side and then drop on to the rocks below.
Two ski patrol members, a man and a woman, sustained injuries but were immediately airlifted to Grenoble hospital where they are now receiving treatment. A third man has since been taken to Bourg-Saint-Maurice hospital after feeling some neck and back pain. The forth ski patrol member, along with the pilot and mechanic are all well and managed to escape the crash site unharmed.
Full story (in French) in Le Dauphine.