GRAND BLANC, Mich. (Michigan News Source) – The FBI office in Detroit released a follow-up report that highlighted the shooter’s motive surrounding a deadly attack at a Grand Blanc Mormon church on Sept. 28.

The report stated 40-year-old Thomas Sanford of Burton held anti-Mormon beliefs. Sanford’s friends previously stated that he believed Mormons were the “Antichrist.”

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In an interview with Michigan News Source, a candidate for Burton City Council said he realized he chatted with Sanford about a week before the massacre. Kris Johns said he was conducting door-to-door canvassing when he encountered Sanford. Johns said “I truly believe [Sanford] had a negative reaction with someone from the church.”

Sanford killed four congregants and injured nine that day, then set the church ablaze before law enforcement shot and killed him.