It happened on December 27 shortly after 10 p.m.
Police say the 51 year-old woman had just finished her shift at the Sunoco gas station at 33rd and Cecil B. Moore Avenue when she was followed from behind by two men.
They both pointed guns at the woman and demanded she hand over her belongings.
The pair got away with $75 and a cell phone before fleeing East on Berks Street towards 30th Street.
There were no injuries reported.
Surveillance from inside the Sunoco station caught the suspects just before the robbery.
The first suspect is described as a black male, 21-22 years-old, 5'8" tall with a thin build. He was wearing a dark colored hooded sweatshirt with "NIKE" on the back and a black ski mask with white skeleton bones on the face, and armed with a handgun.
The second suspect is described as a black male, 21-22 years-old, 5'8" tall with a thin build. He was wearing a gray hooded sweatshirt, dark colored pants, black mask with white skeleton bones on the face, and armed with a handgun.
Anyone with information should call police at 215.686.TIPS (8477) or text a tip to PPD TIP (773847).
VIDEO: Click here to watch the surveillance video