KATHMANDU, Nepal — Three American citizens were among seven people who were killed when an avalanche swept through a camp on Nepal’s Mount Yalung Ri , police in the south Asian country said Monday.

Two Nepali guides were also killed along with a Canadian and an Italian citizen, Gyan Kumar Mahato, a deputy superintendent with Nepal Police, told NBC News. Four people are missing, and four others were injured in the incident, Mahato said.

The group of five climbers and 10 Nepali guides set out to climb Yalung Ri on Monday morning, he said. But all of the team were buried by an avalanche at around 8:30 a.m. local time (10:30 p.m Sunday ET), he added.

“Because of bad weather helicopters couldn’t fly and a land based rescue was impossible,” Mahato said, adding that several attempts had been

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