Rescuers are searching in difficult conditions for dozens of people feared dead and hundreds missing after a dam collapsed in a remote part of land-locked Laos, one of Asia’s poorest countries, a government official says.

State media photographs show villagers, some with young children, stranded on the roofs of submerged houses, while others show villagers trying to board wooden boats in Attapeu province, the southernmost part of the country.

A senior Lao government official, who declined to be identified because he was not authorised to speak to the media, said dozens of people are feared dead and hundreds remain unaccounted for after the under-construction hydropower dam collapsed on Monday.

“We will continue with rescue efforts today but it’s very difficult, the conditions are very difficult. Dozens of people are dead. It could be higher,” the Vientiane-based official told Reuters by telephone.

The once-isolated Southeast Asian country, one of the world’s few remaining communist states, has an ambitious dam-building scheme in order to become the “battery of Asia”.

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Residents are left stranded on rooftops as the water engulfs their village. Photo: Facebook/LaoFAB

Its government depends almost entirely on outside developers to build its planned portfolio of dams under commercial concessions that agree to export electricity to its more developed neighbours, including power-hungry Thailand.

Environment rights groups have repeatedly warned about the human and environmental cost of the rapid pace of dam construction, including damage to the already-fragile ecosystem of the region’s rivers.

Attapeu is a largely agricultural province that borders Vietnam to the east and Cambodia to the south.

The dam that collapsed is part of the hydroelectric Xe-Pian Xe-Namnoy power project, which involves Laotian, Thai and South Korean firms. The subsidiary dam, known as “Saddle Dam D”, was part of a network of two main dams and five subsidiary dams.

South Korea’s SK Engineering & Construction said part of a small supply dam was washed away and the company was cooperating with the Laos government to help rescue villagers near the site.

An official at the firm said fractures were first discovered on the dam on Sunday and that the company had ordered the evacuation of 12 villages as soon as it became clear the dam could collapse.

–ABC