Kolkata, April 9 -- The National Investigation Agency (NIA) has registered 12 First Information Reports (FIRs) in connection with the mob violence case in West Bengal's Malda district, where seven judicial officers were held hostage for eight hours during a protest against the removal of names in the special intensive revision (SIR) of electoral rolls, the agency said in a statement on Thursday.

The agency said that while five FIRs were lodged at the Kaliachak police station, seven FIRs were lodged at Mothabari police station.

Seven court-appointed judicial officers - two of whom were women - were trapped inside the BDO's office for more than eight hours on Wednesday night until the police escorted them out around 10 pm on April 1. An e...