Officers on-duty saw an individual firing a handgun just before 8:20 a.m. in the 3900-block of West Madison Street in East Garfield Park, Chicago police said.
"During the incident, (an) Officer fired his handgun in return," CPD said in a statement.
No one was struck and no one is in custody.
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Police did not immediately provide additional information about the circumstances surrounding the incident.
Area Four detectives are investigating.
This is a developing story; check back with ABC7 Chicago for updates.