French police say three of the four victims killed in the Alps were shot in the head - but they still don't know the reason for the attack.

They were found in a car yesterday and are believed to be British ... while the body of a cyclist was also found close to the scene.

A young girl has been taken to hospital with gunshot wounds while another four year old girl was discovered alive under the bodies in the vehicle eight hours later.

Prosecutor Eric Maillaud (Pron: Mye-oh) admits until a neighbour on the campsite came forward, they had no reason to believe she existed: