The situation is being monitored closely, the prime minister said.
"My thoughts are with all those affected by floods in parts of Bihar," Modi said.
"Centre assures all support to Bihar government to mitigate the flood situation. Teams of @NDRFHQ are in Bihar for rescue and relief work," the PMO tweeted.
Due to rains in the catchment areas of Nepal and Seemanchal district, rivers like Mahananda and Kankai in Bihar have swelled leading to floods in four districts.
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