Police are searching for several men that held up a Hess gas station in Philadelphia – and then stayed there for more than three hours, posing as clerks and selling gas at a discount for cash-only customers.

The suspects walked into the station Tuesday around 1 a.m. — one of them wearing a Hess t-shirt — possibly tricking a worker into thinking he was a delivery man, police told MyFoxPhilly.com.

They first held-up the worker for cash and then tied him up the innocent clerk and locked him in the bathroom. One of the suspects clocked the victim over the head with a gun, causing it to go off – the bullet grazed the victim’s head, MyFox Philly reported.

Instead of fleeing, the thieves hung out, while the crook in the Hess T-shirt pumped gas to clueless customers at a discount if they paid in cash.

The clerk was able to free himself and call the police after the thieves fled.