Chicago police are investigating a string of robberies of cab drivers by young women.
In an alert, the department says about six or seven women between the ages of 16 and 20 have been robbing the cab drivers at knifepoint this month.
According to the alert, the women get into a cab in Chicago's downtown area and ask to be taken to the city's South Side. Police say when they arrive at their destination, they pull out a knife, put a cord around the driver's neck and demand money before they flee.
Anyone with information about the robberies is asked to call the Area Central Bureau of Detectives at 312-747-8380.