After the discovery of four victims on Sunday, prosecutor Karline Bouisset said the body of a 39-year-old woman and a sixth victim, a man, were found during search operations on Monday.
One person also suffered slight injuries in the avalanche while eight others also swept up were unharmed, the prefecture said. The avalanche covered an area of 1,000 metres by 500 metres.
No avalanche warning had been issued for the region by weather authority Meteo France, but a combination of warmth and wind may have been behind the disaster, the prefecture added.
“We’re thinking of [the victims] as well as of their families,” President Emmanuel Macron wrote on Twitter. “Our emergency services have been mobilised to find those still trapped in the snow.”
Emergency responders had deployed a helicopter as well as mountain rescue dogs to the scene, although the prefecture warned that a further avalanche could not be ruled out.