The crash was reported at about 10:18 a.m. in the southbound lanes of the Tri-State Tollway in Alsip, a village roughly 15 miles southwest of downtown Chicago. Images from the scene showed the SUV overturned in the far-left lane and multiple ambulances parked nearby.

State police confirmed that injuries were reported but did not immediately say how many people were hurt or how serious their injuries were. No further information about the driver, passengers or the cause of the crash was available Wednesday.

The two left southbound lanes remained closed while troopers investigated, and drivers were warned to expect delays through the area. It was not immediately clear when the lanes would reopen.

The crash occurred on a stretch of I-294 maintained by the Illinois Tollway, a 294-mile system that carries tens of thousands of vehicles daily through Chicago's western and southern suburbs. Median-barrier strikes and rollovers are among the most common serious crash types on the tollway network, and even brief lane closures during the morning commute can ripple into significant backups on parallel routes.

Anyone who witnessed the crash or has information is encouraged to contact the Illinois State Police. This story will be updated as more details become available.