GRAND BLANC TOWNSHIP, Mich. — The deadly weekend attack on Mormon churchgoers in Michigan was a targeted act of violence, but investigators have yet to learn precisely what led an ex-Marine to crash his truck into a house of worship before unleashing a storm of gunfire and arson, officials said on Monday.

Four people were killed and eight others were wounded in the rampage, which unfolded during Sunday morning services at the Church of Jesus Christ of Latter-day Saints meetinghouse in Grand Blanc Township, about 60 miles (97 km) northwest of Detroit, according to police.

The suspect, identified as Thomas Jacob Sanford, 40, from the nearby town of Burton, was shot dead in a parking lot outside the building about eight minutes after the carnage began, police said.

U.S. military records sh

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