Authorities in western Michigan are investigating what they’re calling a complex and suspicious case after eight people, including six children, were found dead inside a burning home.

Police and firefighters responded Friday to the house in Grand Haven Township, where investigators say several of the victims had gunshot wounds.

The children ranged in age from 5 to 15.

Investigators believe the fire was intentionally set and say they’re looking at the possibility of a murder-suicide.

They are not searching for any outside suspects.