Assam has been the worst-hit state, with widespread flooding and heavy damage. 

Chief Minister Himanta Biswa Sarma said the region has suffered an unprecedented disaster. 

In Kerala, days of heavy rain have triggered floods and landslides, forcing more than 10,000 people into over 300 relief camps. 

Meanwhile, at least 22 people have died in lightning strikes in the eastern states of Bihar and Jharkhand since Tuesday.