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Flash floods have killed at least 160 people and left hundreds missing in a border area of Nepal and China. Experts determined a glacial collapse caused the disaster in the warming Himalayan region. Nepalese police report 157 dead, while China’s state broadcaster reports at least three dead there and over 260 missing. Drone footage shows roads destroyed and buildings buried. At least 400 people were missing in Nepal. Many were on a pilgrimage to a sacred Hindu site. India, the U.S., Australia, Britain and Canada reported their citizens were missing. U.S. seismologists say the glacial collapse measured a magnitude of 5.2 and sent debris flowing downstream with catastrophic impact. Nepalese climate experts said one river rose 27 feet in half an hour.

China’s Xinhua News Agency says mudslides caused by a glacial collapse in Tibet have left 558 people missing. Meanwhile, police in Nepal reported Thursday morning that at least 162 people were killed. Massive flash floods in a border area of Nepal and China on Wednesday left hundreds of tourists, workers and others missing after suddenly sweeping through communities and halting travel in some areas. Chinese state broadcaster CCTV says that 260 of the 558 missing people were foreigners and two villagers were rescued. At least three people were killed as of Thursday morning, it said.