The robbery happened at 1:00 p.m. Wednesday at the Citizens Bank located at 5607 Vine Street in the city's Hadington section.
According to investigators, the man entered the bank and handed a teller a demand note. The teller complied, handing over an undisclosed amount of cash.
The suspect then fled the scene.
Authorities have released surveillance photos of the suspect. He is described as a white male in his late 20s to early 30s, approximately 6' tall, medium build, with dirty blond hair and a goatee. He wore a long-sleeve shirt with a multi-colored design on the chest.
The suspect is considered armed and dangerous.
Anyone with information about this robbery or the suspect is urged to call the FBI at 215-418-4000 or the Philadelphia Police Department. There may be a reward for information leading to this subject's capture and tipsters can remain anonymous.