Chicago police spokesman Tom Ahern tweeted just after 8 a.m. that no officers were injured in the incident near 18th and Morgan Streets.
Area Three detectives are interviewing persons of interest, he said.
At least one person was seen being taken into custody on the scene about 7:30 a.m.
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Chicago police did not immediately provide any information about any other injuries, but asked residents to avoid the area.
The incident drew a large police presence to the area about 7 a.m.
Anyone with information on the incident is asked to submit tips to cpdtip.com.
This is a developing story; check back with ABC7 Chicago for updates.
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