Sri Lankan authorities issued fresh landslide warnings on Sunday with rains lashing areas already devastated by a powerful cyclone, as the death toll rose to 618.

More than two million people -- nearly 10 percent of the population -- have been affected by last week's floods and landslides triggered by Cyclone Ditwah, the worst on the island this century.

The Disaster Management Centre (DMC) said monsoon storms were adding more rain and making hillsides unstable, including the central mountainous region and the north-western midlands.

Helicopters and planes were being used on Sunday to supply communities cut off by landslides in the centre of the country.

The Sri Lanka Air Force said it had received a planeload of relief supplies from Myanmar on Sunday, the latest batch of foreign aid.

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