Millions of tons of ice contained in glaciers surrounding the flash-flood-hit valley in Nepal and China are at risk of collapse, which could cause yet another natural disaster, experts warned today. The death toll from the floods has already reached over 1,000 as rescue teams scramble to reach communities cut off by the August 26 disaster. China's Ministry of Water Resources warned yesterday of a 'major risk' from the glaciers surrounding the Cuojian River in Nepal, where a glacier collapsed, sending large amounts of rock, ice and meltwater into valleys across Nepal and Tibet. Floodwaters swept away homes, buildings, roads, and bridges, carrying mud and rocks downstream and causing widespread devastation. The ministry said water levels at a barrier lake after flooding in Nepal had fallen significantly, but warned unstable glaciers downstream could trigger further flooding. Synthetic aperture radar (SAR) imagery captured on Monday morning showed the area of the water body at the impact crater on Nepal's Cuojian River had shrunk to about 83,000 square metres down from 108,000 square metres on Sunday morning.While water is currently draining through the channel, further landslides could block the river and create another barrier lake, the ministry said.Meanwhile, China's Meteorological Administration issued a warning for more rain in Gyirong county in Tibet over the next three days.