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At least four people were killed and eight others wounded in an attack that included gunfire and arson at a Mormon church in Grand Blanc Township, Michigan, Sunday.

The suspected gunman, identified as Thomas Jacob Sanford, 40, a Marine Corps veteran from Burton, Michigan, was killed by police in a church parking lot, according to authorities.

Sanford rammed a silver GMC pickup truck into the front of The Church of Jesus Christ of Latter-day Saints. He opened fire with a weapon and used gasoline to start a devastating fire inside the church.

The FBI, which is leading the investigation, is treating the shooting as “an act of targeted violence,” said Reuben Coleman, acting special agent in charge of the bureau’s Detroit field office.

Here is what we know about the attack. All times are approximate.

Suspect in church shooting lived in nearby Burton

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10 a.m.: Church service begins with hundreds of congregants in attendance.

10:25 a.m.: A man later identified as Sanford rams a silver GMC pickup truck bearing two American flags into a wall of the church building, according to investigators. He exits the vehicle, fires "several rounds" with an assault-style rifle, at congregants and sets fire to the church using gasoline.

10:26 a.m.: First responders arrive in less than a minute. Church members flee the building in panic, some shielding children.

10:33 a.m.: Sanford exits the church after starting the fire. He is killed in a brief exchange of gunfire with two officers, one from the Grand Blanc Township Police Department, the other from the Michigan Department of Natural Resources, in a rear parking lot of the church.

12:43 p.m.: Grand Blanc police report the church fire has been contained.

All congregants have been accounted for, police said at a morning news conference on Sept. 29. Those treated at Henry Ford Genesys Hospital ranged in age from 6 to 78.

“We are looking at improvised explosive devices that were recovered during the investigation," said James Deir, special agent in charge of the Bureau of Alcohol, Tobacco, Firearms and Explosives’ Detroit Field Office. The church was severely damaged by the fire.

A motive has not been determined. A candidate for Burton City Council who campaigned at Sanford's door told the Detroit Free Press that Sanford went on a tirade against the church and said Mormons were "the antichrist."

The U.S. Marine Corps confirmed Sanford served in the Marines between 2004 and 2008. He held the rank of sergeant and worked as an Organizational Automotive Mechanic and Vehicle Recovery Operator, USA TODAY reported.

Sanford was deployed in Operation Iraqi Freedom for just over six months ending in early 2008. He was awarded the Marine Corps Good Conduct Medal, Sea Service Deployment Ribbon, Iraq Campaign Medal, Global War on Terrorism Service Medal and the National Defense Service Medal.

Grand Blanc Township is a town of 8,000 people near Flint, Michigan. Its Mormon church, with about 150 members, is one of the largest in the area, according to the Guardian.

The FBI is asking the public to share any information that might be helpful by calling 1-800-CALL-FBI or go to tips.fbi.gov.

CONTRIBUTING Joey Garrison, Chris Quintana, Will Carless, Christopher Cann, Kristen Jordan Shamus, USA TODAY

SOURCE USA TODAY Network reporting and research; Reuters

This is a developing story that will be updated.

This article originally appeared on USA TODAY: How the Mormon church shooting unfolded in Grand Blanc, Michigan

Reporting by Janet Loehrke, Stephen J. Beard, George Petras, Dinah Voyles Pulver and Ramon Padilla, USA TODAY / USA TODAY

USA TODAY Network via Reuters Connect