New details are emerging Monday about the gunman in a fatal attack on The Church of Jesus Christ of Latter-day Saints in Michigan.

Thomas Jacob "Jake" Sanford, 40, drove his vehicle through the front doors of the church and fired multiple rounds from an assault rifle during Sunday services, authorities said. Sanford also apparently used gas to start a fire at the church, officials said. The attack killed at least four people and at least eight others suffered injuries requiring hospitalization.

Sanford served in the U.S. Marines from 2004 to 2008, CBS News confirmed. He was an Iraq war veteran who deployed for several months during 2007 and 2008, according to service records provided by the Pentagon.

White House spokesperson Karoline Leavitt said on Fox Monday morning that FBI

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