UN Secretary-General Antonio Guterres on Sunday expressed his deep condolences to victims' families after a huge chunk of glacier fell into a river in the northern Indian state of Uttarakhand, triggering a huge flood and leaving over 100 people missing and feared dead.

"The Secretary-General is deeply saddened by the reported loss of life and dozens missing following the glacier burst and subsequent flooding in Uttarakhand state, India, on Sunday. The Secretary-General expresses his deep condolences to the families of the victims and to the people and Government of India," Stephane Dujarric, Guterres' spokesman, said in a statement.