The theft happened around 2:30 a.m. Tuesday, June 10, 2014 at the Subway located on 1046 W. Patrick Street in Frederick.
Officers say during the investigation it was discovered the unknown person forced entry into the restaurant and stole an undisclosed amount of money.
Photographs and video surveillance of the suspect show the person wearing a blue hooded sweatshirt, dark blue jeans, black gloves and black or brown shoes, police say.
Anyone with information on this crime is asked to call the Frederick Police Department at 301-600-7553. Callers may also remain anonymous and can call the Frederick Police Department's Crime Tip Line at 301-600-8477.
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