What caused the flash flooding?

Nepalese authorities initially believed that an earthquake had caused the flash flooding on the Nepal-Tibet border, but authorities have since confirmed that it was actually triggered by a landslide. "Additional analysis of long period seismic waves indicate that the seismic energy was instead generated by a landslide," says the US Geological Survey. Officials with Nepal's department of meteorology and hydrology have told the BBC that a massive chunk of ice may have collapsed from a mo