The incident happened around 10:30 p.m. on April 26 at Panda Chinese Food at 6601 N. Uber Street.
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Police say the suspect placed an order, but then became angry because of how long she had to wait for her food.
The victim, a 41-year-old woman, told police the suspect began cursing before pulling out a silver revolver and pointing it at her.
The suspect fled the shop a short time later. No one was injured.
Anyone with information about the suspect is asked to contact Philadelphia police.