Offers of help for Nepal are coming in from around the world.
Rescue teams in Los Angeles were preparing to leave for Kathmandu with specialist equipment.
It is a race against the clock to reach those who may still be alive beneath the rubble.
Los Angeles County Fire Department Chief John Tripp told reporters: “Our main mission – and we’re committed to this mission because we live in earthquake country – is that we find people in collapsed buildings and we try to rescue them, and then lend aid to them.”
Rescue teams from China have also left Beijing bound for Nepal.
They are taking specialist equipment, as well as sniffer dogs trained in finding survivors.
Checks for casualties and damage continue to be carried out in neighbouring countries, including China, India and Bangladesh, which also felt the quake and aftershocks.