At least 70 people have died since Wednesday in floods triggered by heavy monsoon rains in various parts of northern India, national radio reports said on Thursday.

The floods caused severe damage in the states of Punjab, Bihar and Uttar Pradesh, and local authorities have asked the army for assistance in relief operations.

India's monsoon season, which usually occurs from early July to September, is vital for harvesting but regularly inflicts major destruction.

In early August floods swept along the coast of the Bay of Bengal in the south of the country, affecting around 50 neighborhoods in Hyderabad, the capital of Andhra Pradesh, and killing over 70 people.