Investigators are actively working to determine what led an Iraq War veteran to attack a Church of Jesus Christ of Latter-day Saints congregation in Grand Blanc Township, killing four people and wounding eight others before being shot dead by police.

Thomas Jacob Sanford drove through the front entrance of the church Sunday morning, opened fire on worshippers, and set the building on fire before responding officers killed him.

The FBI continues to chase down leads and interview survivors and witnesses. The ATF's National Response Team, comprised of highly trained experts specializing in fire, explosives, and bombing investigations, is on the ground combing through what's left of the church building and analyzing burn patterns.

"So we've got piles of debris everywhere. We've got a ceilin

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