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The UN has launched a $415m (£270m) appeal for those affected by Nepal's earthquake, as frustration mounts at the pace of relief efforts, the BBC reported.

The UN said it wanted to support government efforts to provide emergency relief over the next three months.

Riot police have clashed with people trying to leave the capital Kathmandu, and there are reports of villagers blocking trucks carrying supplies.

The government says it has been overwhelmed by the disaster.

Saturday's 7.8-magnitude quake killed more than 5,000 people and injured at least 10,000.

The UN says more than eight million people have been affected and some 70,000 houses have been destroyed.

Although aid is starting to get through, some people in remote areas closest to the epicentre of the quake are stranded without shelter, food or water.

"Although I am heartened and encouraged by the progress of the response to date, efforts need to be maintained and stepped up to ensure vital assistance reaches all the affected, especially those in the remote areas," said the UN's resident co-ordinator for Nepal, Jamie McGoldrick.

Some helicopter crews who have managed to land in isolated communities have been faced with desperate villagers pleading to be airlifted to safety.