The party was taking place just after midnight at an establishment in the 5100-block of South Kolin Avenue in Archer Heights, CPD said.
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There was a verbal altercation, and members of an opposing gang began shooting, according to CPD.
A 51-year-old man was shot in the arm, and taken to Mt. Sinai hospital in fair condition; a 34-year-old man was also shot in the arm and taken to Holy Cross hospital in fair condition; and a 52-year-old was shot in the arm and hip and was taken to Holy Cross in fair condition.
RELATED: River North shooting: 4 shot, 1 fatally, outside nightclub, Chicago police say
During a news conference, CPD said five people were shot, and two people were in serious condition.
CPD gives update on 2 overnight shootings
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Area One detectives are handling the incident.
No arrests had been made later Sunday morning.
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