The Subway on the east side of Whitewater was the subject of an armed robbery on March 10.
The store was robbed of an undisclosed amount of money by a suspect wearing all black and a white skull mask, and was carrying a knife, according to a Whitewater Police Department news release from the same night.
Police responded at 7:35 p.m. to the incident.
The employee handed over the requested money to the suspect and was uninjured, the news release said.
Neal Kolb, detective lieutenant for the Whitewater Police Department, was contacted for additional information about the case. There was no additional information that was able to be released, he said on Tuesday.
Anyone with information on the robbery is being encouraged by Whitewater police to call Kolb at (262) 473-0555. Tips can be placed anonymously at whitewater-wi.gov/crime-alerts.