At least 77 people have now been killed and nearly two million affected by heavy monsoon rains that caused floods in Assam state in northeastern India.
The Brahmaputra river and many of its tributaries have breached their banks, washing away thousands of homes as well as roads, bridges and power lines.
Emergency shelter, food and medicines have been distributed and mobile medical teams deployed to prevent the outbreak of disease.
Prime Minister Manmohan Singh, who flew over the worst affected areas, has called it one of the worst such disasters to strike India recently.
