COPA said the officer was driving in the 7200-block of South Spaulding Avenue in the city's Chicago Lawn neighborhood when the officer saw someone suspected of firing a gun at a home nearby.
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COPA did not provide any additional information about what happened next.
There was an exchange of gunfire, and the officer was not hurt.
SEE MORE: Off-duty police officer exchanges gunfire with armed person in Chicago Lawn: CPD
COPA said it was not immediately clear if the suspect, who fled the scene, was injured.
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The officer involved will be placed on routine administrative duties for 30 days.
Anyone with information is asked to contact COPA at 312-746-3609 or ChicagoCOPA.org.
The video in the player above is from an earlier report.
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