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The FBI is looking into the Michigan church shooting and fire as an incident of targeted violence.

Authorities identified ex-Marine Thomas Jacob Sanford, 40, as the suspect who allegedly smashed a pickup truck into the Church of Jesus Christ of Latter-day Saints in Grand Blanc, opened fire and set the building ablaze during a crowded Sunday service.

Police killed Sanford after he allegedly killed at least four people and wounded eight. Authorities said he was from the neighboring small town of Burton.

"I can confirm at this time that the FBI is now leading the investigation and is investigating this as an act of targeted violence," Reuben Coleman, acting special agent in charge of FBI Detroit Field Office, said on Sunday.

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