What scientists say about the cause of deadly Nepal-Tibet floods

Satellite imagery suggests a section of glacier about 2,000 feet wide broke off at an altitude of around 17,000 feet, falling nearly 4,000 feet to the valley below, said geologist Daniel Shugar

The cause of the deadly landslides and floods along the Nepal-Tibet border is not yet certain, but experts say the risk of such events is compounded by the extreme topography of the Himalayas.