Missing Persons: More than 800 to 1,500 people remain missing on both sides of the border, including many foreign tourists and pilgrims.

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Missing Persons: More than 800 to 1,500 people remain missing on both sides of the border, including many foreign tourists and pilgrims.

Cause: Experts and the US Geological Survey report that a glacial collapse and debris flow triggered the sudden, devastating floods.

Rescues: Bad weather and damaged roads are making it very difficult for rescue workers to reach the worst-hit areas.