More than 1,000 people have been killed in Nepal's deadliest earthquake for more than 80 years, police say.
The 7.8 magnitude quake struck an area of central Nepal between the capital, Kathmandu, and the city of Pokhara.
There were also victims in India, Bangladesh, Tibet and on Mount Everest, where avalanches were triggered.
The government has declared a state of emergency in the affected areas, and help has been offered by countries around the world.
Little information has emerged from the epicentre, where extensive damage has been reported, and there are fears the death toll could rise yet further.
The Nepalese information minister has told the BBC that 1,500 people had been killed in the disaster, but that the true casualty figure would probably be much higher.
Thousands of people are spending the night outside their houses, following a series of aftershocks.
Offers of aid:
The US is sending a disaster response team and has released an initial $1m (£0.7m) according to the US aid agency USAid
India has sent several aircraft, carrying medical supplies and a mobile hospital, as well as a 40-strong disaster response team, including rescuers with dogs
The UK is sending an eight-strong team of humanitarian experts
Pakistan is sending four C-130 aircraft carrying a 30-bed field hospital and army doctors and specialists; urban search-and-rescue teams equipped with radars and sniffer dogs; and food items, including 2,000 meals, 200 tents and 600 blankets
Norway has promised 30 million krone (£2.5m; $3.9m) in humanitarian assistance
Germany, Spain, France, Israel and the European Union are also pledging to send aid
Many more people are trapped under rubble. Local television pictures showed rescuers in Kathmandu desperately digging through the rubble with their bare hands in search of survivors. Many historic buildings in the capital were also destroyed.
Eyewitness: Sandesh Kaji Shrestha, Kathmandu
Kathmandu has been very badly affected by the earthquake. Some areas are completely destroyed.
I am in the Thamel area and the Hotel Budget has been completely demolished with more than 50 guests inside.
I have been helping to pull people and bodies out of the rubble, along with my friend. We pulled a child out with its grandmother earlier. They did not survive.
I am most sad. It has been a very bad experience and a terrible and very difficult day.
There are not enough rescue teams here. The hospitals are out of control. We need help.
UPDATE: At least 1,457 believed to be dead after massive earthquake strikes in Nepal -- and according to Int'l Mountain Guides, current reports are at 14 dead, about 50 injured on Mt. Everest:http://abcn.ws/1zXAz1V