There have been recent incidents in the 5400-block of South Spaulding, the 5800-block of South Homan, the 5200-block of South Pulaski and the 6500-block of South Pulaski.
Police are looking for a man and woman who sometimes work as a pair.
The incidents occurred during March and April. Victims are usually approached and asked if they know someone named Maria, though in one case the name Jennifer was used, and then they are robbed.
The robbers are both described as either white or Hispanic. The woman is believed to be 17-20 years old, 5'3"-5'8", 115-130 lbs., with brown eyes and brown or black hair. The man is believed to be 17-28 years old, 5'7"-6'0", 150-180 lbs., with hazel eyes and short black hair.
There's also an increase in robbery-related incidents in the 6300-block of South Kildare. Robbereis were reported on that block April 7 and April 14.
In those cases, two men were the robbers. They are descirbed as white or Hispanic. One is 20-22 years old, 5'6", 130 lbs., with brown eyes and black hair. the other is believed to be 20-28 years old, 6'0", 200-220 lbs., with brown eyes and black hair, who may have a tattoo on his neck.
Anyone with information is asked to call police.