Rescuers searched Himalayan valleys and hillsides on Thursday after a flash flood that killed at least 359 people and left nearly 1,000 missing, as Nepal and China warned of a risk of fresh flooding from water pooling in two lakes.
Both countries said a glacier collapse on Wednesday morning sent a huge torrent of rock, ice, mud and debris cascading through Himalayan mountain river systems, sweeping through villages and key infrastructure down a route thronged by trekkers and pilgrims that links Kathmandu with Lhasa in Tibet. Of those missing, at least 540 are foreigners.
Authorities in Nepal used helicopters to search for survivors and drop emergency supplies to thousands cut off in towns and valleys, while emergency services recovered dozens of bodies swept down into the plains.
The sheer amount of water and debris stirred up now risks triggering a further disaster.
Nepal's disaster management authority warned that a lake formed by debris blocking the Bhotekoshi River at the flood site was rising and at risk of bursting, while on the other side of the border China said that some 3 million cubic metres of water — the equivalent of about 1,200 Olympic-sized swimming pools — was expected to flow into an already dammed lake over the next three days.
There is a high risk the lake could breach, with peak flow expected around September 1, Chinese state media said, citing the water resources ministry.
"The volume of water is continuing to increase, and so is the risk," Zhu Jinfeng, a researcher at the ministry's hydrology department, told state broadcaster CCTV.
TORRENT TORE THROUGH BORDER CROSSING
Chinese rescuers had yet to reach the worst-hit area on the Chinese side of the border, the Gyirong border crossing, by Thursday evening, state-media reports indicated, as crews worked to clear debris from the key access road leading to the area.
The Gyirong border port has a key role in China's Belt and Road network linking the country to South Asia, with logistics zones and parking lots built there in the past decade.
Dramatic footage on Wednesday showed enormous torrents of muddy water and debris tearing through structures in the border crossing area within seconds and engulfing people trying to flee.
All the buildings in the border-crossing complex, including the border gate, a stately building bearing China's national emblem and housing customs and immigration agencies, were destroyed by the mudslide, footage filmed from a military helicopter surveying the area and broadcast on state television showed.
The entire compound was reduced to an unrecognisable mass of destruction, caked in thick, muddy debris and almost devoid of any sign of civilization, the footage showed.
The tally of missing in Tibet's Gyirong County was 558, Chinese state broadcaster CCTV said on Thursday, including 260 foreign nationals. China said the death toll stayed at three.
China's Premier Li Qiang, the country's No. 2 official, arrived at the disaster-stricken site in Gyirong on Thursday afternoon, state-run Xinhua news agency said. The visit suggested Beijing was treating the disaster as a matter of the highest national priority.
Ajkaler Khobor/MK
