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DONGHEKOU, China—Two rivers blocked by landslides threatened to flood towns shattered by China’s massive earthquake, sending thousands of survivors fleeing Saturday in a region still staggering from the country’s worst disaster in 30 years.

A mountain sheared off by the mighty tremor cut the Qingzhu river and swallowed the riverside village of Donghekou whole, entombing an unknown number of people inside a huge mound of brown earth.

Compounding the horror for survivors, a lake rising behind the wall of debris threatens to break its banks and send torrents cascading into villages downstream.