A gunman opened fire inside a Church of Jesus Christ of Latter-day Saints chapel in Michigan during a Sunday service and set the building ablaze, killing multiple people and injuring others before police shot him, authorities said.

At least four people are dead, and several others were injured after a gunman opened fire at a church in Michigan during Sunday service, police said.

Officials have interviewed more than 100 people as they work to establish why a gunman attacked a church and set it on fire.