The jury is still out to decide what caused the Uttarakhand disaster on 7 February 2021 - a glacial lake burst or avalanche. The exact cause of what triggered the sudden surge of water in Dhauli Ganga, Rishi Ganga and Alaknanda rivers is still not clear. Chamoli district of the Himalayan state has been badly affected and 32 people have been killed while around 150 are still reported missing.