Police said the suspect entered the Subway, at 931 W. 75th St. in Naperville, at 10 p.m., displayed a gun and demanded money. He got away with an undisclosed amount of cash.
The victims in the armed robbery were not injured.
Naperville Police Units arrived on scene within minutes after a 911 call was placed. They searched the area but did not find the offender.
The suspect is described as a tall male with lighter complexion and thin build. He was wearing a black hood, black scarf over his face and dark pants.
The case remains under investigation by the Naperville Police Department.
Anyone with information concerning the case or identity of the suspect involved is asked to contact the department at 630-420-6666or call the Naperville Crime Stoppers Hotline at 630-420-6006. Your information is important to Crime Stoppers, and all callers may remain anonymous.