A 20-year-old Michigan woman was arrested last week after an infant and a toddler were found abandoned outside a high school in Madison Heights.

Police did not say if the woman is the children’s mother and have not identified her, WDIV reported.

A driving instructor for the Official Driving School found the children on July 15 when he stopped at Lamphere High School for a break. John Belyea said he heard strange noises that he initially took to be fighting cats but then realized they were the sounds of a child.

He searched the area and found a 4-week-old baby and a 2-year-old child in car seats behind a brick wall. He called 911, and first responders quickly arrived, whisking the children off to a hospital for observation. They were reported in stable condition.

Police said a note was found with the children, but they have not revealed its contents.

Police said on Thursday they had identified the children’s parents and taken the 20-year-old woman into custody. Child Protective Services was also contacted, they said.

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[Featured image: Lamphere High School/Google Maps]