CHICAGO (CBS) — An Illinois State Trooper was released from the hospital Tuesday morning, several hours after he was injured in an altercation with an armed motorist on the Tri-State Tollway.

Police said the altercation happened around 7 p.m. Monday at the Halsted Street toll plaza in the northbound lanes of Interstate 294 in South Holland.

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The trooper saw a “suspicious person” at the toll plaza, and when he confronted the person, a struggle ensued, and the suspect’s gun discharged several times, state police said.

The trooper, who was injured in the neck, but not by gunfire, was transported to a hospital. He was released Tuesday morning and was doing well, police said.

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The suspect — described as an African American male wearing a “construction type” vest and black jeans — fled on foot and was still at large Tuesday morning, police said.

A weapon was recovered at the scene.

A person of interest in the case was taken in for questioning on Monday, but has been cleared, according to police.

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Anyone with information is asked to call the Illinois State Police at 630-241-6800- Extension 5028.