KATHMANDU, Nepal — The government of Nepal is asking foreign search-and-rescue teams to leave now that the likelihood of finding survivors buried by last month’s earthquake has largely passed, and a top Nepalese tourism official said Monday that no more climbers were likely to ascend Mount Everest this season.

“We have already asked them to go home,” Laxmi Prasad Dhakal, a Home Ministry spokesman, said on Monday of the foreign rescue teams, adding that roughly half the 4,000 rescuers had already left. “I think all the rescuers will go to their respective countries by Friday.”

Some of the rescuers, however, said they had no intention of leaving immediately.

The leader of a large Spanish team, who spoke on the condition of anonymity because he had not been authorized by his embassy to speak publicly, said Nepal’s government would soon divide Kathmandu, the capital, into sectors so that various teams would have responsibility for specific parts of the city. In the early days of the rescue effort, teams often ended up searching the same sites because of a lack of coordination.