Guwahati, Aug. 28 -- Nepal faces the risk of a second flash flood after debris from an ice-rock avalanche formed a temporary dam at a river confluence, the International Centre for Integrated Mountain Development (ICIMOD) said.

The debris is accumulating at the confluence and holding back water, raising the possibility of another flash flood in the valley as more water collects over the next three days, according to ICIMOD.

The temporary lake could also breach gradually and release water without triggering another flash flood, it said.

The warning came as Nepal remained on alert following devastating flash floods along the Nepal-China border. The Nepal Police reported a death toll of 538 on Friday, with more than 1,400 people still mis...