NEW DELHI (AP) — Hundreds of rescuers dug through slushy debris and fast-flowing, icy water Friday in a search for survivors after a glacial lake burst through a dam in India’s Himalayan northeast, a disaster that many had warned was possible for years. The flood began in the early hours of Wednesday, when a water from a lake high in the mountains broke through the concrete of the dam, rushing down the valley below and killing at least 31 people. 100 are still missing, officials said, while thousands of people have had to flee their homes. It wasn’t clear what triggered the flood. The deadly flood was the latest to hit northeast India in a year of unusually heavy monsoon rains.