CHICAGO (CBS) — The inbound Dan Ryan Expressway was shut down from the Interstate 57-Bishop Ford Freeway merge to 83rd Street Thursday afternoon.

The closure was due to a police investigation, authorities said.

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Illinois State Police said they were investigating a shooting that happened Tuesday.

At 2:57 p.m. Tuesday, two men – ages 22 and 20 – were shot in a car on the Dan Ryan at 87th Street. Two other men were in the car with them and drove them to Jackson Park Hospital.

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Police also closed the Dan Ryan Tuesday night to search for shell casings.

No one had been arrested in the case as of Thursday afternoon.

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By 5 p.m., all lanes were back open.