Several people were feared dead as hydropower dam under construction collapsed in Laos. The ensuing flash flooding, which swept away homes, left hundreds missing, said state media Tuesday. The dam collapsed at 20.00 hours on Monday releasing 5 billion cubic meters of water and several hundred people are missing and homes have been swept away, the Lao News Agency said. It said several people had died. More than 6,600 people have been left homeless. Officials have brought boats to help evacuate people in San Sai district of Attapeu province, where the Xepian-Xe Nam Noy hydropower dam is located, as water levels rise after the collapse, ABC Laos news reported. The South Korean company building the dam said heavy rain and flooding caused the collapse and it was cooperating with the Laos government to help rescue villagers near the dam. "We are running an emergency team and planning to help evacuate and rescue residents in villages near the dam," a SK Engineering & Construction spokesman told Reuters by telephone. Prime Minister Thongloun Sisoulith "suspended the planned monthly meeting of the government for August and led his Cabinet members and other senior officials to Sanamxay (district) to monitor rescue and relief efforts being made for flood victims," the official Lao news agency KPL said. Many areas of Laos have recently been hit by flooding from seasonal rains. A video posted by the ABC Laos news on its Facebook page showed villagers stopping to watch fast-flowing water from the side of a river bank. Communist Laos, one of Asias poorest and most secretive countries, aims to become the "battery of Asia" by selling power to its neighbors through a series of hydropower dams. Environmental rights groups have for years raised concerns about Laos hydropower ambitions, including worries over the impact of dams on the Mekong River, its flora and fauna and the rural communities and local economies that depend on it. The collapsed dam was expected to start commercial operations by 2019 and export 90 percent of its power to Thailand under a Power Purchase Agreement between the Xe-Pian-Xe Namnoy Power Company (PNPC) and the Electricity Generating Authority of Thailand (EGAT). The remaining 10 percent of power would be sold to the local grid under an agreement between the PNPC and the Electricite du Laos. KPL said the Xepian-Xe Nam Noy project cost an estimated $1.02 billion.