Authorities are scrambling to rescue thousands of people stranded in flooded villages after a week of heavy rains killed at least 52 and uprooted countless others from homes in India.
A government statement says 26 deaths have been reported in eastern Assam, where incessant downpours have damaged roads and snapped telephone cables in several districts.
Home Minister Rajnath Singh flew over the worst-hit areas on Saturday and said the floods were "very serious".
Twenty-six deaths have been reported in eastern Bihar due to drowning and home collapses in 10 districts bordering Nepal.
Floods are an annual occurrence in Assam, Bihar and many parts of India during the June-September monsoon season.
