The incident took place this afternoon when the youths came in separate motorbikes to the bank and snatched away money from the staff.
"The private security guard deployed by the bank was seriously injured as the youths beat him up before entering the building," said Pipili Police Station inspector in-charge (IIC) Sushil Kumar Mishra.
Mishra said the gang members threatened the five bank staff before decamping with the money from the cash counter.