(STMW) — A Chicago Police officer fired at least one shot at a suspect who opened fire early Sunday in the North Side West Ridge neighborhood.

24th District officers were on patrol in the 6400 block of North Claremont about 4 a.m. when multiple shots were fired, according to a statement from police News Affairs.

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An officer discharged his weapon, and at least one suspect fled the scene in a vehicle, according to the statement. It’s not yet known if the suspect was shot.

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No one is in custody as of Sunday morning. Police are searching for the suspect and the vehicle.

No officers were injured. The Independent Police Review Authority, which handles all police-involved shootings, is investigating.

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(Source: Sun-Times Media Wire © Chicago Sun-Times 2016. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.)