At least 25 people have been killed and more than 100 are missing after a dam collapsed in southeast Laos on Monday. The hydroelectric dam was under construction when it went down, and sent flash floods through six villages. More than 6,600 people are now homeless in Laos, and around 25,000 people are being evacuated from the Stung Treng province in northern Cambodia, according to Laotian Prime Minister Thongloun Sisoulith. Community discussions were held in some nearby areas before the dam was built, and the organization International Rivers said residents’ concerns were not heeded. We’ll discuss what led to the tragedy and how it could’ve been prevented with Ian Baird, an associate professor at the University of Wisconsin-Madison. He’s an expert on Laos and impacts of dams.