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Massive flooding near the border with Tibet killed at least 19 people in Nepal on Wednesday, but hundreds of tourists were still out of contact hours after the disaster hit.

A torrent of mud and debris burst from the banks of a river between China and Nepal, burying buildings and triggering a frantic search for survivors.

Chinese state media reported “major casualties” from a mudslide at a Tibet trade hub on China’s side of its border with Nepal, and President Xi Jinping ordered an “all-out” rescue effort.

“I got a call from [my brother-in-law] this morning, and they were crying and said their entire house had been swept away. Three family members were rescued, but his brother is still missing,” said 56-year-old Raju Bhadel.