The Savoie region of the French Alps was placed on red alert for avalanches on Monday after heavy snowfall had raised the danger level to "exceptional" – which reportedly only happens around once every 30 years.
The country's weather agency Météo France placed the department of Savoie on red alert – the highest warning level – on Monday afternoon due to the heightened risk of avalanches caused by heavy snow.
The agency described the danger as of "exceptional intensity" and said numerous avalanches were expected on Monday evening.
More than 1,800 of these avalanches could take unusual trajectories and may hit roads and villages, the agency said.
Meanwhile the Hautes-Alpes department is on orange alert (one level below red) for avalanches and the Alpes-Maritimes is on orange alert for avalanches and storms.
The public are advised to avoid high roads in the area and to heed the safety advice in ski resorts.
The heightened danger has been caused by heavy snow in recent days and more is forecast to fall between Monday afternoon and Tuesday morning.
The mountains most affected are the massifs de Haute-Maurienne and Haute-Tarentaise, which includes the ski resorts Bonneval and Bessans and Tignes and Val D'Isere.
Various roads have been blocked in the region with villages cut off.
The avalanche risk is expected to recede on Tuesday late morning.