The September attack at a Michigan church in which a gunman opened fire and set the building ablaze was motivated by anti-religious beliefs, the FBI announced Friday.

Four people were killed and nine others were wounded in the Sept. 28 attack at a Church of Jesus Christ of Latter-day Saints in Grand Blanc Township. The suspect, Thomas Jacob Sanford , 40, a former Marine, was killed by law enforcement.

One month after the devastating shooting, the FBI's Detroit field office disclosed the suspected motive behind the attack.

Jennifer Runyan, the FBI special agent in charge of the Detroit field office, said in a video statement on Friday that the attack was a targeted act of violence "believed to be motivated by the assailant’s anti-religious beliefs against the Mormon religious commu

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