On Mount Everest, meanwhile, helicopters ferried the last stranded climbers from the mountain's base camp, where at least 19 people — including one Australian — were killed when Saturday's quake triggered a huge avalanche.

The landslide reported on Tuesday hit the village of Ghodatabela, which is part of a region north of Nepal's capital that is often visited by trekkers, said Rasuwa District Governor Uddhav Bhattarai, according to the Reuters.

"This area is in a natural park which is popular with tourists. We are trying to rescue them, but bad weather and rainfall is hampering efforts," Bhattarai told Reuters.

Officials said at least 250 people were unaccounted for, according to news reports. Further details were not immediately available. Ghodatabela is about a 12-hour walk from the nearest town, the Associated Press reported.

International relief and rescue teams have poured into Nepal as the scope of the devastation becomes clearer. Rescue crews said some villages were nearly levelled, and overwhelmed centres in Kathmandu tried to cope with a growing stream of people injured or in desperate need of aid.