It happened at 11:20 a.m. Tuesday in parking lot of the Pathmark supermarket in the 100 block of West Chelten Avenue.
Police say two men approached a 74-year-old woman. One grabbed the woman's pocketbook, then both fled west on Wayne Avenue.
Investigators say the man who snatched the purse was caught on surveillance video several hours before it happened.
They have released the following description of the suspects:
Suspect #1: Black male, 16-18 years-of-age, light complected, wearing khaki pants, red hooded sweatshirt underneath a dark colored jacket and a dark colored back pack.
Suspect #2: Black male, 16-18 years-of-age, dark complected, wearing khaki pants, dark colored pull-over sweater with brown on the shoulders.
Anyone with information about this crime or these suspects is asked to contact Philadelphia Police Northwest Detectives Division at 215-686-3353/3354.