Police said a 51-year-old off-duty officer was driving north in the 2700-block of Halsted when he saw two people running south toward his vehicle, one of whom police said had a gun.
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The off-duty officer got out of his car, pulled out his gun and fired one shot, police said. The two people then fled. No injuries were reported.
Sources told ABC7 there was an attempted carjacking in progress at the time of the incident, but police have not confirmed that detail.
Ald. Timmy Knudsen, who represents the city's 43rd Ward, tweeted that an off-duty sergeant fired a gun at two people in an alley in the 2700 block of North Halsted.
"On duty officers responded quickly, but no arrest has been made at this time," he said in his tweet.
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The Civilian Office of Police Accountability (COPA) tweeted that they are responding to the scene for an off-duty officer-involved shooting.
This is a breaking news story. Check back with ABC7 Chicago for updates.
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