Superintendent of Police C Sudhakar said two persons died on the spot when the crude bombs they were making in their home in Kumripara village burst last night. Another person sustained injuries and was rushed to Murshidabad Medical College Hospital, he said.
Combing operations in the area has led to the recovery of a large number of "socket bombs", Sudhakar said.
Bye-elections are being held in the district for 34 seats to the gram panchayat and panchayat samiti today.
Murshidabad district along with Burdwan, Nadia and Birbhum is among the volatile regions of the state and the site of pitched political turf wars, a police official said.