A group of climbers have died from suspected carbon monoxidepoisoning in their tents on Mount Everest.
Four bodies were found at Camp Four overnight on Tuesday by Nepali sherpas, who were on their way to collect the body of another climber who died near the summit over the weekend.
Camp Four, the highest camp on Everest, is located at around 8,000 metres (26,246 feet) - 850 metres below the summit.
It was not clear how the climbers died and their identities had not been established when Mingma Sherpa of the Seven Summit Treks group confirmed the deaths to reporters on Wednesday morning.
"It is most likely they died from carbon monoxide poisoning by using their stoves in the tent without proper ventilation," US climber Alan Arnette, who blogs on Everest, said in a post.
Ten people have died so far in a series of accidents this climbing season - four more than mountaineering officials expect in a typical year.
Indian climber Ravi Kumar, American doctor Roland Yearwood, Slovak climber Vladimir Strba and Australian Francesco Enrico Marchetti all died over the weekend.
More than 5,000 climbers have scaled Mount Everest since it was first climbed by New Zealander Sir Edmund Hillary and Sherpa Tenzing Norgay in 1953, and nearly 300 have died trying.
The climbing season begins in March and closes at the end of May when the rainy season traditionally begins, bringing cloud and snow at highaltitudes.