Officers were called to the 3700-block of Diefenbaker Drive at around 12:30 a.m. CT on Oct. 1.
A man reportedly entered the store, produced a rifle, and then fled with an undisclosed amount of cash and cigarettes. He was last seen running northbound in the alley behind the business.
No injuries were reported.
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The man is described as five-foot six, and was last seen wearing a dark grey hoodie with the hood up to conceal his identity. He also wore a black belt with a large silver belt buckle and black shoes with white soles.
Anyone with information is asked to contact Saskatoon police at 306-975-8300 or Crime Stoppers at 1-800-222-8477.