Police said officers were responding to a report of an assault in progress at about 7:22 p.m. in the 2600-block of West Devon Avenue.
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Police said the suspect approached them with the knife and one officer fired a single shot and another officer then used a Taser on him.
The man was taken into custody and transported to a hospital for treatment, police said. One officer was transported to a hospital for observation.
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Police originally said the suspect was not hit by gunfire but Monday morning they said he was grazed on his thigh.
The Civilian Office of Police Accountability is investigating.