Discrepancy in WB cops' 2022 blast FIR may not be 'accidental': NIA

NIA investigates Bhupatinagar blast FIR time conflict, suspecting alteration. Witness statements differ, raising doubts on FIR accuracy. Rajkumar Manna, Buddhadeb Manna, Biswajit Gayen involved. House explosion details, hospital deaths scrutinized alongside call records.