At least seven people are dead and 170 missing after a piece of a Himalayan glacier fell into a river and triggered a huge flood in northern India.
The floodwaters burst open a dam and a deluge of water poured through a valley in the state of Uttarakhand.Most of the missing are believed to be workers from two hydro power plants in the area.
Hundreds of troops, paramilitaries and military helicopters have been sent to the region to help with rescue efforts.
Experts are investigating the incident though it is not yet clear what might have caused the glacial burst.
Destruction in its wake
Uttarakhand police said an avalanche struck at about 11:00 local time (05:30 GMT) on Sunday, destroying a dam known as the Rishiganga Hydroelectric Project.
Police said the impact catapulted water along the Dhauli Ganga river, damaging another power project downstream in the Tapovan area.Emergency crew have managed to rescue 16 workers who had been trapped inside a tunnel that had been filled with debris.
Indian media said earlier that around 30 others were trapped in a second tunnel, with emergency crews prepared to work through the night to rescue them.
Uttarakhand, in the western Himalayas, is prone to flash floods and landslides.