Nepal issued a warning on Friday to move to higher ground after a dam upstream in Tibet was reported to have burst, two days after a glacial collapse caused deadly flooding.
"Information has been received that a water dam has burst again on the Tibetan side," police said in a statement.
"All security personnel, rescue workers, and the general public deployed in rescue and relief operations are requested to remain alert and immediately move to a safe location/report the incident."
The U.S. Geological Survey said the disaster on Wednesday, the deadliest for Nepal since a 2015 earthquake, was caused by a glacial collapse that triggered a vast flow of icy debris.
China paused its rescue operation at the hardest-hit part of Tibet over renewed risks of flooding, state media said. A lake formed by immense piles of debris after a mudslide hit the China-Nepal border has begun overflowing toward the Gyirong border area where rescue teams were headed, Chinese state broadcaster CCTV said.
Nepal's disaster authority spokeswoman, Shanti Mahat, said an initial rise in water had been seen.
"Information has been received that the flow of muddy waters has increased slightly in the same area where there was a big flood, in Rasuwa's Bhote Koshi river, and there is a risk of further flooding," said Mahat, who works for the National Disaster Risk Reduction and Management Authority (NDRRMA).
The death toll in Nepal from the flash flood that hit its border regions and neighboring Tibet on Aug. 26 has climbed to 472, with nearly 1,000 people still unaccounted for.
The disaster was triggered by a glacier collapse, which unleashed a massive surge of rock, ice, mud and debris down river systems throughout the Himalayan mountains.