(REUTERS) - Drone video released on Monday (April 27) offers a unique view of the devastation in parts of Nepal, three days after a 7.9-magnitude earthquake killed at least 3,700 people and left scores more injured.

The aerial footage shows holy temples and residential homes severely damaged or destroyed.

A senior interior ministry official said the death toll could rise to as high as 5,000.

Key highways have been blocked by landslides, and many villages and communities are without water and electricity, surviving on salvaged food and with no outside help.

While aid has begun arriving in the capital, including consignments of food, medical supplies, tents and sniffer dogs, the authorities are struggling to get relief out to devastated areas, overwhelmed by bad phone lines, poor roads, a lack of equipment and strong, repeated aftershocks.

As the focus begins to shift from the dead to the survivors, international aid agencies and officials warned the spread of disease is now the biggest concern. The monsoon season, which brings heavy rains, begins in Nepal at the end of May.