Illinois State Police troopers canvass the westbound lanes of Interstate 94 near Duffy Lane after a shooting on Sunday. | Photo: Nicole Baron.

State police shut down Interstate 94 near Bannockburn on Sunday to conduct an investigation after a gunman opened fire on a pickup truck, authorities said.

The incident happened around 2:30 p.m. Sunday on westbound Interstate 94 near Duffy Lane in Bannockburn.

Illinois State Police District 15 troopers responded to a call of shots fired that came from a silver or black Honda Civic.

The driver of the Honda Civic pulled a gun and fired at least three shots into a red Ford pickup truck.

The victim of the Ford was not struck by the gunfire, according to Illinois State Police Trooper Genelle Jones.

Police closed all lanes of westbound Interstate 94 by 2:55 p.m. Sunday to search for evidence on the expressway, Jones said.

Traffic was diverted off to Deerfield Road in Deerfield from Interstate 94.

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The eastbound lanes of Interstate 94 were partially closed after a report of a shell casing was spotted by a passerby.

All lanes were reopened by 3:30 p.m. No suspects were in custody following the incident and the motive for the shooting was not known.