Almost 41 million people have been affected by flooding and landslides in India, Bangladesh and Nepal and there is possibility the situation could deteriorate further as rains continue in some flood-affected areas, a UN agency said.

United Nations humanitarian agencies are working with the Government and partners in Nepal to bring in clean water, food, shelter and medical aid for some of the 41 million people affected by flooding and landslides in Bangladesh, India and Nepal.

Nearly a thousand people have been killed, and tens of thousands of homes, schools and hospitals have been destroyed in Bangladesh, India and Nepal. "There is the possibility that the situation could deteriorate further as rains continue in some flood-affected areas and flood waters move south," the UN Office for the Coordination of Humanitarian Affairs (OCHA) on Friday said in an updated note.

In India, rescue operations are ongoing in many flood-affected areas, with those stranded being rescued by helicopter. More than 600 people have died and 32.1 million people have been affected with the floods, OCHA said.