A powerful landslide involving ice and rock, rather than an earthquake, triggered the deadly flash floods that swept through parts of Nepal and Tibet, the United States Geological Survey (USGS) said, clarifying an earlier report of seismic activity. A magnitude 4.9 earthquake may have triggered the collapse of a type of a glacier called a 'cirque glacier'. Key points and original sources are listed below.

• A powerful landslide involving ice and rock, rather than an earthquake, triggered the deadly flash floods that swept through parts of Nepal and Tibet, the United States Geological Survey (USGS) said, clarifying an earlier report of seismic activity. The agency...S1

• A magnitude 4.9 earthquake may have triggered the collapse of a type of a glacier called a 'cirque glacier'.S2