CPD said the boy was inside his home about 1:05 a.m. in the 8000-block of South Harvard Avenue when he was shot in the torso.
He was taken to Comer Children's Hospital, where he is listed in serious condition.
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A source close to the investigation said it appears this was a stray bullet, and the boy was not targeted.
No one is in custody, and Area Two detectives are investigating.
Police did not immediately provide any information about a possible suspect.