Rescuers in Nepal and China battled Sunday through leg-sucking mud and the threat of rising rivers and a newly formed lake to search for thousands missing after a deadly wall of water and debris swept through the Himalayas, engulfing entire villages.

Latest figures from both countries put the number of missing at 3,044, with a further 750 confirmed deaths — and reports of some bodies possibly swept downstream as far away as India.

The disaster, which struck the China-Nepal border Wednesday morning, was caused by a glacial collapse, sending a wall of water and debris downstream, the U.S. Geological Survey said.