Hundreds of people are missing and an unknown number dead after a dam 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, Laos News Agency said.

"Several human lives" were lost and "several hundreds of people [are] missing", it added.

More than 6,600 people have been made homeless by the floods, reports said.

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