A massive flash flood in the Himalayan nation of ​Nepal washed away villages and project sites in ‌a region bordering Tibet, authorities said ​on Wednesday (August 26, 2026), warning of heavy casualties ⁠as they urged those living on river banks to seek higher ground.

The areas of Syapru Besi and ‌Timure in the mountainous district of Rasuwa were severely affected, government officials said, ‌while calling for extra vigilance by ‌residents ⁠along the Bhote Koshi river.

“We have reports ⁠of villages and infrastructure project sites being washed away,” district administrator Narendra Pariyar told Reuters, adding that no ​immediate estimates of casualties ‌or property losses were available.

“There could be heavy casualties or loss of property,” he said. “But I cannot say for sure now.”

Prime ‌Minister Balendra Shah said rescue and ​relief teams, as well as police and the military had been dispatched ⁠to help in the aid effort.

“Instructions have been given … to move the people living in the ‌lower areas to safer places,” he said.

“People along the river are advised to exercise extra caution and remain alert,” the government said in its statement.

The Bhote Koshi river originates in Tibet and empties ‌into Nepal’s Trishuli river that eventually flows into India ​as the Gandak river.

A flood last year in the Bhote Koshi river killed ⁠nine people, with 24 missing, and washed away ⁠the ‘Friendship Bridge’ linking Nepal and China to disrupt transport and trade for several months.

That ‌flood was triggered by the draining of a supraglacial lake in Tibet, a ​regional climate monitor said.