BELFAST, Maine (AP) Police in Maine are investigating the death of a 3-year-old boy who died after a family member brought him to a hospital in Belfast.

Police have not released the name of the child or family members. The state police’s major crimes unit is investigating the death, which happened in Stockton Springs, the Bangor Daily News reported.

Police have also not released the boy’s cause of death, which they learned about on Sunday afternoon. The child died that afternoon at Waldo County General Hospital.