Nepal has eight of the 14 highest peaks in the world. Climbers have said in recent years that conditions on the mountains have deteriorated and risks of accidents have increased, with some blaming global warming.
Avalanches are not very frequent on Mount Manaslu, but in 1972 one struck a team of climbers and killed six Koreans and 10 Nepalese guides.
Ang Tshering of the Asian Trekking agency in Katmandu, who has equipped hundreds of expeditions, said low snow levels and the increased number of climbers on Manaslu have made climbing conditions difficult.
"It used to be a low-risk mountain in the past but now that has all changed," Tshering said, adding that conditions have become more unpredictable.
Associated Press writer Angela Charlton in Paris contributed to this report.
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