At least eight people have been killed in the floods in Nepal, a police spokesperson said, as the country braced for more casualties and worse damage from the waters which destroyed houses and roads.

The flood in Rasuwa - an area north of Kathmandu bordering Tibet - is feared to have swept away villages.

Anil Goel sent his family in the U.S. a photo of his tour group at the Nepal-Tibet border just before the area was hit by a wall of mud and water.

Follow live updates as rescue teams search for survivors of catastrophic flash floods in Nepal and China, where 90 Americans are among hundreds of people unaccounted for.

The flood disaster on the Nepal-Tibet border is far worse than first known, with hundreds now dead and more than a thousand missing, including dozens of Americans, as a lake swelling behind the debris raises fears of a second flood and rescuers race to reach survivors.

In a still-unfolding disaster, verified videos showed dozens of people swept away at the border, with authorities on both sides fearing far higher casualties and massive destruction.

About 1,600 schoolchildren were saved by their teacher shortly before the school was inundated in last week's devastating floods.

The U.S. has pledged 3.5 million in flood aid for Tibet and Nepal, with the first $500,000 distributed by Catholic Relief Services. An aid worker with the group explains what flood survivors need now.