It happened around 2 am Thursday near Belmont and Chestnut Avenues.
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Police say the suspect approached the clerk asking for a gift card.
When the clerk told him the store doesn't sell gift cards at night, the suspect pulled out a gun and demanded a card.
The suspect took the card and rode off on a bike south on Chestnut.
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Officers say the suspect was wearing a black mask and a burgundy hoodie with a small silver handgun.
The clerk was not hurt.