The official Disaster Management Centre said 112 people were still missing, with 50 injured in hospital, since torrential rain and landslides swept away entire villages.

Floodwaters were receding in some areas after a break in the rain, giving authorities a chance to deliver much-needed supplies to victims who lost everything in the deluge.

Heavy rains on Friday triggered the worst flooding and landslides in 14 years in the southern and western parts of the island.

Many villages were still underwater Sunday, officials said.

Nearly 2,000 houses were damaged or completely destroyed. Almost half a million Sri Lankans had been forced from their homes, with most moving into temporary shelters.

The charity Save the Children said about a tenth of those displaced were children below the age of five years.

It said raised fears of stagnant flood waters becoming breeding grounds for dengue spreading mosquitos and noted that young children were more vulnerable.

Medical teams were dispatched to the worst-affected areas to help prevent an outbreak of waterborne diseases.

“We have the expertise to deal with this situation,” Health Minister Rajitha Senaratne said, adding cholera and diarrhoea had been successfully prevented in past floods.

The government withdrew an evacuation order for thousands of residents in the southern district of Matara as water levels subsided.

“The threat of floods around the (river) Nilvala has subsided,” irrigation department director M. Thuraisingham said.

“The flood levels near Colombo have also gone down because we did not have rain in the past 24 hours.”

Water levels in Ratnapura, Sri Lanka’s gem district east of Colombo, subsided but many villages in Kalutara, south of the capital, were still under water, officials said.