Janesville police are investigating an early Monday morning armed robbery at Campbell’s 5 Points Mobile in the 600 block of West Milwaukee Street. Officers responded at 1:36 a.m. to the convenience store to learn a man, who displayed a handgun and demanded an undisclosed amount of money from the lone store clerk, had fled on foot. A Rock County Sheriff’s Office K9 unit tracked the suspect from the scene but the robber, described as a black man around 5 feet 8 inches tall and 190 pounds, was not located. Officers, who said no one was injured during the incident, are reviewing video surveillance in their ongoing investigation. Anyone with information about this robber, who was last seen wearing a black/gray hooded sweatshirt, dark jeans and white shoes, should call police at 608-755-3100, Janesville Area CrimeStoppers at 608-756-3636 or download the free P3 tips app at the Apple store or Google play store to provide crime tips anonymously.