The robbery occurred at 12:49 p.m. on October 7th at the Star Mini Market on the 1200 block of Ritner Street.
Police say four males wearing dark hooded sweatshirts entered the store with a gun.
The suspects pointed the gun at the 53-year-old male employee and demanded money.
Police say the suspects forced the employee toward the cash register and took an unknown amount of money as well as several boxes of cigarettes.
The suspects then fled the store and were last seen south on Camac Street towards Porter Street.
On Thursday, police released surveillance video of the crime.
Anyone with information should call 215-686-TIPS (8477) or text a tip to PPD TIP or 773847.