Police said in each incident, the man approached his victims with the shotgun and demanded the victims' property. In one of the robberies, police said a victim was shot.
The robberies occurred Saturday in the:
7500-block of North Ridge Boulevard at 4:45 a.m.
2200-block of West Howard Street at 4:50 a.m.
2100-block of West Birchwood Avenue at 5:00 a.m.
The suspect is described as a man, 20-35 years old, 5'6"-5'9", 150-180 pounds, short black beard and wearing a black shirt and black pants with a dark-colored double-barrel shotgun.
Anyone with information is asked to contact Area 3 Detectives at (312) 744-8263.