SANAMXAI, Laos—Troops searched for survivors in the remote southern tip of Laos on Thursday, three days after the collapse of a hydropower dam sent a torrent of water across paddy fields and through villages, as rescuers rushed aid to thousands of homeless.

Parents carry their children as they leave their home during the flood after the Xepian-Xe Nam Noy hydropower dam collapsed in Attapeu province, Laos July 26, 2018. Retuers/Soe Zeya Tun
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