Thomas Jacob Sanford, the man who opened fire at a Mormon church in Michigan on Sunday before setting it ablaze, made a chilling confession to Kris Johns, a resident running for city council.

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.