Two 17-year-old boys were wounded by gunfire Monday evening on the Dan Ryan Expressway near 87th Street.
Someone in a vehicle fired shots into another about 6:30 p.m. in the northbound lanes, Illinois State Police said in a statement.
The victims were driven to a nearby hospital for treatment, state police said. Their injuries were not life-threatening.
The 18-year-old woman driving the vehicle was uninjured, while an 18-year-old male passenger was injured by shattered glass, state police said.
Authorities shut down lanes and northbound ramps at 94th and 83rd for two hours for an investigation.