Rescuers found more bodies overnight as they dug through slushy debris and ice-cold water in a hunt for survivors after a glacial lake burst through a dam in India’s Himalayan northeast, washing away houses and bridges and forcing thousands to flee.

Officials said the hundreds of rescuers recovered six more bodies early Saturday, bringing the death toll to 47. At least 150 people are still missing.

The flood began shortly after midnight Wednesday, when the waters of a glacial lake overflowed, cracking open the biggest hydroelectric dam in Sikkim state. The icy waters then cascaded through towns in the valley below, where it killed scores of people and carried some bodies kilometers (miles) away downstream, where they were found in the neighboring state of West Bengal and Bangladesh, police said.