Police say three black men entered the Caribbean Food Store on Kern Street around 9:00 p.m. Tuesday.
According to a news release, one of the men showed the clerk a gun, and assaulted the clerk.
The men are described as being 20 to 30 years old. One of the suspects was last seen wearing a kakhi outfit, another was wearing a grey jacket and the third man was wearing dark sweatpants.
The trio left the store with an undisclosed amount of money.
If you have any information that could help catch these men, call the Winchester Police immediately at (540) 662-4131.