Disaster experts say Nepal glacier collapse was difficult to predict

It was a wall of water and mud travelling at such speed that it engulfed buildings in seconds. In the wake of the Nepal flood disaster, questions were being asked about whether the deadly torrent could have been predicted or detected quicker to give communities downstream more time to evacuate.Geologists say they believe the flash floods in Nepal and Tibet were set off by a dual high-altitude landslide and glacial avalanche that unleashed huge volumes of water. Disaster experts say such events are difficult to forecast.