Five cars were damaged by rocks that were thrown on I-57 on Sunday night, the third such incident on an area expressway in recent days.
The cars were damaged about 8 p.m. Sunday on northbound I-57 near 147th Street, Illinois State Police District Chicago Sgt. Juan Valenzuela said.
There was no significant damage to the vehicles, Valenzuela said, though some sustained shattered windows.
No one is in custody and no one was injured.