Officers responded about 3 a.m. to a person who was barricaded in a house in the 4100-block of West Maypole Avenue, and asked residents to avoid the area.
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Maypole is blocked from Keeler Avenue to Pulaski Road, and warming buses are on standby for residents.
RELATED: Oak Forest City Hall candlelight vigil honors mother, 2 children killed in murder-suicide
CPD has not said what prompted the barricade situation or if the person is armed.
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Last week, four people were left dead after a barricade situation in Oak Forest, officials said.
This is a developing story; check back with ABC7 Chicago for updates.