By Krishna Pokharel and Raymond Zhong 

KATMANDU, Nepal--The flow of foreign climbers leaving Mount Everest accelerated Thursday amid mounting fears about safety on the world's highest peak and the reluctance of Sherpa guides to return to work after an avalanche killed 16 of their comrades.

Suber Shrestha, a government liaison for the tourism ministry, estimated that eight foreign climbing teams had canceled their expeditions by Thursday evening.

Among those remaining, he said, "most of them are in the mood to quit."

Lakpa Sherpa, the head Sherpa guide at Alpine Ascents International, a Seattle-based tour operator, said guides on his team are only staying to pack up their gear and dismantle their camps.

Almost 40 expedition teams had been preparing to go up Mount Everest this season.

There is a "mass exodus under way," said Brooks Entwistle, a retired partner at Goldman Sachs whose team decided to cancel its climb earlier this week.

In a statement Thursday, Nepal's tourism ministry urged all expeditions to proceed as planned, following a meeting between government officials, Sherpa guides and tour operators at Everest base camp.

Several foreign-run tour operators were still meeting Thursday evening to decide whether to restart their own climbing activities.

Hoping to lure back tour companies that have canceled their trips, the tourism ministry said it would extend the validity of this season's climbing permits for five years.

Nepal's government usually charges between $25,000 and $150,000 per team for the permits.

After a majority of Sherpa guides decided to halt the climbing season, tourism minister Bhim Acharya flew to Everest base camp on Thursday from Katmandu, Nepal's capital, for some face-to-face diplomacy.

During Mr. Acharya's visit, according to people present, an avalanche occurred on the same slope as last week's deadly avalanche, reinforcing safety concerns about the route up the mountain.

Nobody was on the mountain at the time. But the new avalanche reinforced concerns about this season's route up the mountain, which climbers and government officials said is already too late to change.

"We are ready to go to any extent to facilitate the expeditions," said Maddhu Sudan Burlakoti, joint secretary of the tourism ministry, who accompanied Mr. Acharya to Everest base camp on Thursday. "We are even ready to allow helicopters to fly to Camp One," he said, referring to the first campsite after the dangerous stretch of shifting glacier ice where the guides were killed last week.

Write to Krishna Pokharel at krishna.pokharel@wsj.com

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