Three armed robberies have been reported in the last two weeks in the Lake View, North Center and Lincoln Square neighborhoods on the North Side.
The suspects approach victims from behind as they walk on the sidewalk, then pull out a handgun and demand property, according to a community alert from Area North detectives.
The robberies happened about 4:20 a.m. July 30 in the 1600 block of West Roscoe; about 2:35 a.m. Aug. 3 in the 3800 block of North Western; and about 4:45 a.m. Aug. 8 in the 4700 block of North Campbell.
The first suspect is described as a black man between 17 and 25, 5-foot-6 to 6-foot, and 140-170 pounds with a medium complexion, wearing a black or blue and white striped hooded sweatshirt, police said.
The second suspect is described as a black man between 17 and 25, 6-foot-1 and 170 pounds with medium complexion, wearing a black leather jacket.
Anyone with information should call detectives at (312) 744-8263.