The robbery happened at 10:20 a.m. Tuesday at the Citizens Bank at 2516 Welsh Road.
Police say the suspect walked up to the counter and told the teller he had a gun.
After taking an undisclosed amount of money the suspect fled on foot east on Welsh Road.
The suspect is described by police as a white male, 20-30 years-of-age, 5'4", thin build, wearing a black shirt, blue jeans and a red Phillies baseball cap.
Anyone with information is asked to contact Philadelphia Police at 215-686-TIPS (8477), text a tip to PPD TIP (773847) or through PhillyPolice.com.
