What to know

• Rescue helicopters have been unable to land in affected areas due to high flood waters. The leaders of Nepal and China ordered major rescue operations.S1
• Homes have been destroyed, and power disrupted.S2
• A wall of water swept down a Himalayan river valley shared between Nepal and the Chinese territory of Tibet.S3
• Videos shared by Nepal Police and others on social media showed torrents of muddy water crashing through mountain valleys in the Himalayan nation's districts bordering Tibet.S4
• Nepal sent helicopters to the rescue on Wednesday after a massive flash flood swept away villages, killing eight and damaging roads, bridges and power projects in areas near Tibet, authorities said. Across the border, Tibet reported “major casualties” with som...S5