The masked suspect walked in to the store located on the 5400 block of North Broad Street Monday morning.
He then pulled out a gun, jumped over the counter and pointed it at the clerk's head.
At one point, police say the suspect fired one shot into the ceiling because the clerk was having trouble opening the register.
After taking $400-$500 in cash, the gunman fled. The clerk was not hurt.
The suspect was last seen driving a red Toyota Camry with a partial Pa. Tag EJB.
If you have any information about this crime , please contact: Northwest Detective Division (215) 686-3353/3354