By Rebecca Cook

GRAND BLANC, Michigan (Reuters) -Authorities on Monday were working to determine why an ex-Marine drove his pickup truck into a Michigan church during a Sunday service, opened fire and set the building ablaze, killing at least four people before he died in a shootout with police.

Hundreds of worshippers were inside the Church of Jesus Christ of the Latter-day Saints in Grand Blanc, Michigan, when the suspect rammed his pickup truck into the front doors on Sunday morning, officials said. Two victims were shot to death, and two other bodies were discovered hours later in the rubble of the church, which officials said was deliberately set on fire.

Officials warned late on Sunday that some people remained unaccounted for, and that more bodies could yet be found as investigat

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