What happened on Sunday
- A piece of a Himalayan glacier fell into a river and triggered a huge flood in Uttarakhand
- The floodwaters burst open a dam and a deluge of water poured through the valley
- Police said the avalanche struck at about 11 am, destroying the Rishiganga Hydroelectric Project dam
- Most of the 150 missing are believed to be workers from two hydropower plants in the area
- Troops, paramilitaries and military helicopters have been sent to the region to help with rescue efforts
— BBC