BANGOR TOWNSHIP, Mich. (AP) — A mid-Michigan sheriff says he's treating the deaths of a Detroit-area woman and two young children as a murder-suicide.

Bay County Sheriff Troy Cunningham said Wednesday that 31-year-old Nikita Landrum of Farmington Hills and 3-year-old Mikayla Walker were found dead the day before inside a car parked outside a drain maintenance center, and 2-year-old Dariel Walker II was found dead outside the car.

Cunningham says all three had gunshot wounds and police recovered a handgun at the scene in Bangor Township.

It wasn't clear why the family was in the Bay City area, about 90 miles (145 kilometers) northwest of Detroit.