It happened just after 11:30 p.m. in the 300 block of West Erie.
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Police said the suspect became upset after being denied access to the bar.
He returned shortly after with a gun and fired at the security staff standing at the bar, police said.
A bullet grazed a 46-year-old man's arm.
The suspected attempted to flee the scene but was taken into custody and a weapon was recovered.
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The victim was transported to Northwestern Hospital in good condition.
Police confirmed the victim was an employee of the bar.
Charges are pending as Area 3 detectives investigate.