An Oak Lawn police sergeant was driving in the area of 107th Street and Cicero Avenue when he heard two gunshots fired.
A man in his 40s with two gunshot wounds was found by police in a business parking lot, police said. He was transported to a local hospital in unknown condition.
Police from Oak Lawn and other nearby areas attempted to stop the suspect's vehicle, but it escaped at a high rate of speed and ignored traffic signals, police said.
The suspect is described by police as about 30 years old, 5'7"-5'8", 150 pounds and last seen wearing a white T-shirt. He was driving a white 2017-2019 Chevrolet Tahoe which was last seen south bound on I-294 at 147th St.
Investigators said it appears to be a road rage incident, but police are waiting to interview the victim to confirm.
Anyone with information is asked to call the Oak Lawn Police Detective Division at (708) 907-4051 or text tips to (708) 613-8477.