Members of the WPS Tactical Support Team and General Patrol Unit were called to the business just after 5 p.m. on Saturday afternoon.
Police are saying a man entered the business carrying a handgun, while demanding cash and cigarettes.
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The suspect also allegedly assaulted an employee, causing minor injuries.
A description of the suspect is not being provided by police at this time.
Anyone with information is being asked to call Winnipeg police or Crime Stoppers.
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