The robbery occurred at the Quick Mart Food & Tobacco store on the 100 block of West Logan Street around 10 p.m. on Tuesday, Dec. 10, according to Norristown police.
The man entered the store, threatened employees with the firearm, and stole cash from the registers before fleeing south on Locust Street on foot, authorities said.
Norristown police are urging the community to help identify the suspect. Anyone with information is asked to call 610-270-0977 or submit a tip online at Norristown Police Department's website.
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