Police said they received a call that the boy was with his dad, Patrick Hile, at an address in Butler County.
The boy was given to Children and Youth Services and was placed into foster care, according to police.
Hile was arrested on suspicion of endangering the welfare of a child and interfering with the custody of children.
Original report: Pennsylvania State Police are looking for a missing 3-year-old boy.
Investigators said they went to a home in Perry Township in Armstrong County on Friday with Children and Youth Services to take custody of Hollen Hile.
Police said his father, Patrick Hile, was seen going into the woods before they arrived.
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