Leon County deputies say it happened at the Inland Shell gas station at 3500 North Monroe Street around 7:30 p.m.
The store clerk told authorities the armed suspect demanded money and then took off on foot.
A K-9 unit was unable to track him down.
Deputies are looking for a black male about 5 feet, 7 inches to 5 feet, 10 inches tall, with a slim build.
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