Two people have died and at least 25 have been injured following a fire at a ski resort in the French Alps.

Sixty resort employees were evacuated after the blaze broke out at accommodation for seasonal workers in Courchevel in the early hours of Sunday morning.

Footage posted on social media showed fire crews using ladders to rescue trapped workers from the wooden building. At least one person can be seen jumping an upper floor to escape the flames.

Two bodies were found in the burnt-out building, local media reported. They have not yet been identified.

Four other people were seriously hurt but are not thought to have life-threatening injuries.

Authorities in the Savoie region said prosecutors had opened an investigation the cause of the fire, which broke out on building’s third floor at about 4.30am.

A witness said he saw two men jumping out of the burning building to escape the flames. Most of the workers staying there were young, Yarik Zanuda added.

“The two young men who jumped, I saw them after, they are wounded and hospitalised,” he wrote on Facebook. ”Another was saved by firefighters. But the woman who called for help on the third floor, I do not know. I hope she is saved too.”

A seasonal worker who had been staying in the building claimed no fire alarm had sounded. He told French broadcaster LCI: “ I heard, ‘Help, help, help!’ from my room. I went out, I saw the flames.”

About 70 firefighters had brought the blaze under control by dawn. The fire was extinguished by 9.40am local time (8.40am GMT).