A recovery mission began on Wednesday but the initial sorties encountered technical problems

A helicopter mission on Wednesday to remove the bodies of five missing climbers believed killed in an avalanche high in the Himalayas was halted after encountering technical problems, officials said.

Eight climbers - four from Britain, two from the United States, and one each from Australia and India - were reported missing last Friday after they failed to return to their base camp near Nanda Devi, India's second highest mountain.

An Indian air force helicopter on Monday spotted five bodies partially buried in snow high on a slope.

A recovery mission began on Wednesday but the initial sorties encountered technical problems, said Vijay K Jogdande, the top government official in the remote mountain area.

"No bodies have so far been recovered from the three initial sorties this morning," he said, without giving more details.

No more helicopter flights were planned for today, said Police Superintendent Ram Chandra Rajguru, adding that more details will be provided at a news conference scheduled for 0630 GMT.

Authorities will likely take around ten days to recover the bodies, government and police officials said.

The officials said authorities will conduct another aerial reconnaissance on Thursday or Friday to find a way to reach the bodies of the missing climbers or send a team on foot after the team has had time to acclimatize.

There is a possibility of another avalanche which is a big risk to the operation, an official from the Indo-Tibetan Border Police told the media.

The status of the other three climbers is not known, though officials have said the possibility of their survival is remote, and their bodies could be near the five that have been spotted.

An IAF helicopter on Monday spotted five bodies partially buried in snow high on a slope

The paramilitary Indo-Tibetan Border Police Force is carrying out the mission to bring the bodies to the town of Pithoragarh in Uttarakhand.

It has been one of the deadliest climbing seasons in the Himalayas for several years.

More than 20 people have been killed in the mountains, including 11 on Mount Everest, the world's highest peak that has been plagued by poor weather, inexperienced climbers and overcrowding.

Nanda Devi, at 7,816 metres (25,643 feet), and its sister mountain, Nanda Devi East, are among the world's most challenging peaks and only a handful of people have climbed them.