The Chicago Police Department issued an alert after a group of teenage girls robbed at least two cab drivers at knife-point.
The group of seven hails cabs downtown and as they reach south side destinations, choke the driver with a cord or rope while demanding cash. Then, they run away after the robberies.
The attacks have taken place in the 4700 block of South King Drive and the 4800 block of South Forrestville Avenue.
The women are believed to be between the ages of 16 and 20 years old.
Police ask anyone with information to call Area Central detectives at 312-747-8380.