Laos dam damage was discovered 24 hours before disastrous collapse, says South Korean builder

The South Korean partner in a Laos hydropower dam said Wednesday it discovered the upper part of the structure had washed away 24 hours before it collapsed, engulfing villages and leaving hundreds missing.
The wall of water unleashed Monday by the failure of the dam in the country’s southeast surged downstream, sweeping away homes and leaving an unknown number of people feared dead. SK Engineering & Construction, a South Korean builder that is one of the partners in the project,…