A video has emerged of food packets being dropped by helicopters in flood-affected areas to help out victims in northern India.

The incident took place on September 30 in the Rajendra Nagar neighbourhood of Bihar state's capital, Patna.

Visuals showed copters dropping dry rations to provide food for those stuck in inundated areas.

Reports said residents of several places in the Patna district will also be airlifted and moved to safer places.

The district is one of the worst-hit after copious amounts of rainfall caused a flood.

At least 25 people have died in several rain-related incidents in the state.