Rescuers grapple with mountain of challenges after the Nepal-Tibet floods

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What happened
Emergency services are rushing to find survivors and treat the wounded after a devastating flash flood on the border of Nepal and Tibet on Wednesday killed more than 500 people, with over a thousand still missing. But the remote and rugged terrain, as well as the risk of further flooding from upstream lakes formed by piles of debris, make their work as delicate as it is dangerous.
Summary assembled by rule from the sources below