Hundreds of people are missing and an unknown number dead after a dam under construction collapsed in south-east Laos, state media reported.
The collapse at the hydroelectric dam in Attapeu province late on Monday sent flash floods through six villages, Lao News Agency said.
More than 6600 people have been made homeless, it added.
Pictures from the area showed heavily laden boats carrying people to safety through muddy water.
"The disaster has claimed several human lives [and] left hundreds of people missing," the agency reported.
The reason for the collapse of the Xepian-Xe Nam Noy dam is not clear. Its construction began in 2013 and it was due to begin generating power this year.
The incident follows heavy rain and flooding across southern Laos.
Prime Minister Thongloun Sisoulith has postponed government meetings and gone to the affected area in Sanamxay district with senior officials to monitor relief efforts, state media said.
Local authorities have appealed to government bodies and other communities to help provide emergency aid for the victims such as clothing, food, drinking water and medicine.
Hydroelectric ambitions in Laos
- The government in Laos has launched an ambitious dam-building scheme to become the "battery of Asia"
- Laos sits on the Mekong River and its tributaries - a perfect location for hydro power
- The country has 39 hydroelectric power plants, and 53 more are being planned or built
- By 2020, Laos also plans to build 54 more electricity transmission lines and 16 substations
- Laos already exports two thirds of its hydropower, with electricity making up roughly 30 percent of all Laotian exports
- BBC