Nepal's government has declared three days of mourning for the more than four-thousand people who've died in the Himalayan nation's massive earthquake.

The government has raised the toll to 4353, with close to 8000 injured, as volunteers search for dead and missing from the 7.8-magnitude quake.

Another 73 people have died in India, while the toll in Tibet, which neighbours Nepal, has risen to 25.

The Nepal government also says it's going through a difficult time in dealing with a disaster of this scale, in terms of its limited resources.

Australians stranded in Nepal will be flown out by the air force.

While some Australians have returned home on commercial flights, others are waiting for Foreign Affairs to release details of the military flights when arrangements at Kathmandu airport have been made.