Authorities in Nepal will use DNA to help identify the bodies of four climbers who failed their Everest challenge.
"The bodies are not in a recognisable state, almost down to their bones. There is no face to identify them," a senior official said.
"We have directed the hospital to collect DNA samples so they can be matched with any families who come forward."
Nepalese authorities, who control the world's tallest peak, had retrieved the bodies between the Everest base camp and the South Col at 25,938 feet during a clean-up operation.
They were unable to verify how long the bodies had been on the slopes.

Spain dismantles one of Mediterranean's largest human smuggling networks
Thai teen kills 7 in rampage at home and school before shooting himself
Syria says bomb on minibus near Damascus wounded 14, deaths reported mistakenly
Spain hopes to transfer migrant minors to mainland within weeks
Morocco to cooperate on return of minors from Spain after Ceuta crossing
