It happened at 1:30 a.m. Saturday at the Sunoco station at North 5th Street and Erie Avenue.
Police say the victim was standing outside the store when two armed men approached him.
The victim ran as both suspects opened fire. He was hit once in the back of the head and collapsed in the parking lot.
Medics rushed the man to Temple University Hospital, where he underwent surgery.
Investigators are working to identify the suspects and determine what led to the shooting.
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