At least four people were killed and eight others were wounded Sunday in a shooting at the Church of Jesus Christ of Latter-day Saints in Grand Blanc Township, Michigan, according to police.

Authorities say the attacker rammed a vehicle into the front of the church during a large service, opened fire inside the building, and then set a blaze that quickly spread. Officials believe additional victims may still be found as crews search the burned remains.

Officers exchanged gunfire with the suspect and killed him. Investigators have identified the gunman as 40-year-old Thomas Jacob Sanford of Burton, Michigan.

Grand Blanc Township is a suburb of Flint, located about an hour north of Detroit.