Hundreds of people are missing and several are feared dead after a hydropower dam under construction in Laos collapsed, Reuters reported Tuesday. Boats were brought to help evacuate people in San Sai district of Attapeu province, where the Xepian-Xe Nam Noy hydropower dam is located. Water levels have been rising after the collapse, causing flash flooding which swept away homes. Heavy rain and flooding caused the collapse, the company building the dam said, adding that it was cooperating with the Laos government to help rescue villagers near the dam.