Five persons laced with firearms held the staff at gun point and looted Rs 7.75 lakh in cash, said Superintendent of Police, Akhilesh Kumar Jha.
According to the FIR lodged by the Branch Manager R Paswan, the criminals entered the bank at about 11.30 AM and started terrorising the bank staff and customers.
They then forced the cashier to open the bank's strong room, where the cash was kept and looted the money.
Two other criminals were guarding at the entrance, the SP said adding the criminals assaulted some of the customers and exploded a bomb to terrorise them.