Bhagalpur SSP Rajesh Kumar said that the police raid, a part of the security drive conducted before the polls, was conducted following a tip-off that gangster Shambhu Mandal and his associates were hiding at Parvatti mohalla.
"Shambhu and Kanu Mandal managed to flee, but two persons - Dipak Mandal and Tinku Mandal were arrested with the bombs and the explosive material," Kumar said.
The SSP added that the gang used to make bombs and sell them to criminals.