Officers initially responded on Thursday shortly after 11 a.m. to reports of an armed and barricaded person alone in an apartment, police said. As of 6 p.m., the Oak Park Police Department and the Cook County Sherriff's Office remained on the scene.
SEE ALSO | No bail for Chicago woman charged with killing landlord found dismembered in freezer
There was still a heavy police presence and road closures near the 1100 block of North Harlem Avenue on Friday morning, but the armed person surrendered around 5:20 a.m., police said.
The person was transported to a local hospital for a mental health evaluation and no one was injured, police said.
Police have not provided further information about the incident.