Cook County prosecutors said Officer Oneta Sampson Carney was off-duty when this allegedly happened Saturday night at the Sam's Club in Evergreen Park.
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Prosecutors said three men approached Carney and her husband while they were loading their car. That's when they said two of the men offered to help the couple, while a third jumped in the driver's seat and drove off.
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Prosecutors said Carney then fired her gun, hitting the pavement behind the car.
They said the men didn't show a gun or threaten the couple.
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No one was hurt.
Carney is charged with "reckless discharge of a firearm".
Chicago's Civilian Office of Police Accountability is investigating.