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Hundreds of people, including more than 640 tourists, remain missing after the floods hit the Nepal-China border.
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An avalanche caused the Bhotekoshi River to overflow, sending waves of water and mud that swept buildings and people away.
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A wall of mud and rock appeared to collapse ?into a river on the Himalayan border of Nepal and China's Tibet, triggering catastrophic flooding on the Nepali side that killed at least 31 people and left ?hundreds of tourists missing, including Americans.
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