What caused the flooding in Nepal?

Scientists are pointing to a glacier collapse as a key cause of the deadly floods that have swept through parts of Nepal and Tibet.

The glacier in question lies to the north of Langtang Lirung, a peak more than 7,000 metres above sea level in the Himalayas.

As Mark Poynting reports, it's not yet clear what caused the glacier to collapse, but some scientists say a massive landslide could have taken part of the glacier with it.

Produced by Tom Joyner. Graphics by Mesut Ersoz and Leo Scutt-Richter.