Police found the children in a home in West Garfield Park on Sunday. The oldest child is just 11 years old.
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Around 1:30 p.m. on New Year's Eve, police officers were in the 4800 block of West Jackson Boulevard when an 11-year-old boy waved them down.
The child told officers he had been left home alone with other children in the house. There, police found a 1-year-old boy, a 4-year-old girl and a 7-year-old boy. The relationship between the children is unclear.
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Illinois law requires children be at least 14 years old to be left home alone.
All four kids were taken to West Suburban Hospital as a precaution after officers were unable to find a guardian.
Police said a person of interest is now being questioned by Area Four detectives.