Drone footage reveals some of the devastation that the 7.8-magnitude earthquake has had on Nepal.

Police said in a statement that at least 3,617 people have died since the eruption on Saturday (25 April), including 1,302 in the valley of capital Kathmandu alone. That does not include the 18 people killed in an avalanche, another 61 people killed in neighbouring India and 20 in Tibet.

Overwhelmed authorities were trying to cope on Monday with a shortage of drinking water and food, as well as the threat of disease.

Many of the sick and wounded were lying out in the open in Kathmandu, unable to find beds in the devastated city's hospitals. Surgeons set up an operating theatre inside a tent in the grounds of Kathmandu Medical College.

It is the worst earthquake in Nepal since 1934 when 8,500 died. More than 6,500 have been injured.