Several people running out of a Loop bar near Wacker Drive and Wabash Avenue caught the attention of Chicago police officers on patrol Saturday night.
It was a little before 1 a.m. when police said a man sprayed mace inside the pub before taking off.
The Chicago Police Department said officers used a description from witnesses and were able to arrest the man nearby.
Chicago paramedics treated several people from the bar at the scene.
Authorities said they have no word on a motive.
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