PHILADELPHIA (CBS) — Police are looking for a masked gunman who tried to rob a South Philadelphia grocery store last month.

The suspect was seen on surveillance video entering the store on the 1400 block of South 16th Street, just after noon on May 20.

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The suspect pulled out a gun and employees began to scream, say police. The suspect then ran away empty-handed.

No one was injured.

If you recognize anything about the suspect, call 215.686.TIPS (8477).