Nearly 470 killed in Nepal floods: What we know about rescue efforts

At least 469 people have died, and at least 1,500 people remain missing across Nepal and China’s Tibet region after a glacial collapse sent a mountain of mud and rock into a Himalayan river, triggering catastrophic flooding across local towns and valleys, authorities in Kathmandu have said.

The devastating Bhotekoshi flood struck the mountainous Nepal-Tibet border region, with some of the worst damage in Nepal’s Rasuwa district, immediately south of the Chinese border.

Television images showed collapsed homes, floating cars and a metal bridge being washed away, while witnesses said the waters engulfed entire villages.

Search and rescue teams have been wading through the region looking for victims and missing people, but efforts have proven challenging since many roads and bridges have also been damaged due to the flood.

Here’s what we know about the latest rescue efforts and the victims:

Officials initially believed that a magnitude 4.4 earthquake could have triggered the downstream floods on Wednesday morning.

However, several experts and the United States Geological Survey have confirmed that “the seismic event” was a consequence of “a glacial collapse and debris flow that caused subsequent catastrophic impacts downstream” – rather than the other way around.

A glacial collapse is the detachment of a large mass of glacier ice from its bed – sometimes involving millions of cubic metres of ice, rock, and water – that can transform into a highly mobile ice-rich avalanche or debris flow. This collapse is not a formally defined scientific term in glaciology, but is widely used to describe the event.