New Delhi, Aug. 29 -- Even as rescuers worked through mud and debris Friday in areas devastated by a catastrophic flash flood along the Himalayan border between Nepal and China, authorities warned that a newly formed, overflowing lake could trigger further flooding.

Nepalese authorities said all security personnel, rescue workers and members of the public deployed in rescue and relief efforts have been told to remain on high alert and immediately move to a safe location if necessary.

Nepal police spokesperson Abi Narayan Kafle told The Associated Press that the rescue operation is continuing but with authorities remaining on high alert.

"It hasn't stopped," he said.

Where is the lake?

Satellite imagery shown by Chinese state broadcas...