TAYLOR (WWJ) – A 9-month-old girl is in critical condition after she was allegedly beaten by a 15-year-old boy.

Taylor Police Lt. Richard Hopper said the teen is in custody. Neighbors reportedly said the teen has Down Syndrome and is severely mentally handicapped.

READ MORE: Water Testing Shows No Detection Of Hexavalent Chromium After Spill

The 9-month-old was apparently home with her siblings when the teen broke into their apartment. The baby’s parents were not home at the time of the break-in.

Hopper said he wasn’t authorized to give specific details about where the assault took place. However, reports identify the location as Sandee Townhomes near Allen and Pennsylvania roads.

READ MORE: Jury Selection Begins In 2nd Trial In Whitmer Kidnap Plot

It’s unclear how or why the teen beat the child, who was reportedly “on the verge of possible passing away” when she was rushed to the hospital.

The baby’s father told WJBK that police said the boy was covered in blood when they arrived on the scene.

MORE NEWS: Former Sterling Heights City Council Candidate Charged With Election Fraud

Police are expected to release more information later Thursday. An investigation is ongoing.