Amateur video shot from a drone a day after the earthquake that hit Kathmandu gives a birds eye view of the city's devastation.
Landmarks of the Nepalese capital, like the Dharahara tower and some temples, have been destroyed in the April 25 quake, the video showed.
More than 3,700 people have been killed in the earthquake.
A senior interior ministry official said authorities had not been able to establish contact with some of the worst affected areas in the mountainous nation, and that the death toll could reach 5,000.
Thousands of Nepalis began fleeing the capital Kathmandu on Monday, terror-stricken by two days of powerful aftershocks and looming shortages of food and water.
Roads leading out of Kathmandu were jammed with people trying to climb onto buses or hitch a ride aboard cars and trucks to the plains.
Huge queues had formed at the city's Tribhuvan International Airport, with tourists and residents desperate to get a flight out.
Many of Kathmandu's one million residents have slept in the open since Saturday's quake, either because their homes were flattened or they were terrified that aftershocks would bring them crashing down.
Overwhelmed authorities were trying to cope with a shortage of drinking water, food and electricity, as well as the threat of disease. The government appealed for international help.