The man said he was walking on West Addison Street near the CTA Red Line stop just after 12:45 a.m. when a male suspect walked up to him and started making threats, then hit him in the face.
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The individual first allegedly claimed to be a security officer and then said he was a police officer.
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The suspect went north, and police tried to find him but were unsuccessful.
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The victim declined medical treatment on the scene.
No one was in custody later Thursday morning. Area Three detectives are investigating.