In a Facebook post just after 9:20 a.m., the department said officers were in the area of the Aurora Public Library, located at 101 S. River St., conducting an investigation.
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Police said there is no active threat to the public.
South River Street was closed between Benton Street and Downer Place, police said.
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Residents were asked to stay in their homes and avoid the area until the incident was resolved.
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It was not immediately clear what led to the investigation.
The roads reopened hours later, and police said the "incident is resolved."
This is a developing story; check back with ABC7 Chicago for updates.