Bagaha Superintendent of Police Anand Kumar said the incident occurred when three staff of the bank were on their way to the branch on foot after withdrawing money from another bank, but three armed miscreants accosted the bank staff near Beladola Bazar and fired in the air before snatching the bag containing the cash.
After hearing the gun shots, villagers gathered at the incident site and gave a chase to the three miscreants who threw the bag.
The person, who was caught, has been identified as Mohammad Samir, SP said.
Police have been conducting raids to nab the two miscreants who were at large after sealing the borders of Ramnagar, Kumar said.