Illinois State Police were investigating Tuesday after a driver’s back window was shattered by a bullet on the Kennedy Expressway, authorities confirmed.

The shooting occurred on the northbound ramp to Kimball Avenue about 10:45 a.m., state police said. The driver was not struck or injured in the shooting, according to police. Police said it was a possible “road rage altercation” between the victim and the suspect.

The vehicle driven by the man who shot at the other driver was reported as a light blue Mercedes Benz SUV, police said. He then exited at Kimball Avenue, according to police.

No other information was immediately available.

All traffic lanes were open after the investigation.

Anyone who witnessed the shooting or has information about it should contact the Illinois State Police at 847-294-4400.