GRAND BLANC TOWNSHIP, Mich. — Four people were killed and eight were wounded when police said a former Marine smashed his pickup truck into a Michigan church before setting the building on fire.

It happened in Grand Blanc Township near Flint, Michigan, around 10:25 a.m., The Associated Press reported. The alleged attack happened as members of the church were in worship.

Officials give update

Update 12:36 p.m. ET, Sept. 29: Flags have been lowered to half staff in the state of Michigan in honor of those killed in Sunday’s church shooting, Gov. Gretchen Whitmer said in a Monday afternoon news conference.

Bureau of Alcohol, Tobacco, Firearms and Explosives Special Agent in Charge James Deir said ATF has brought in a special response team to investigate the shooting.

He said the team is examining improvised explosive devices that were found at the scene.

FBI Acting Special Agent in Charge Ruben Coleman said it is being investigated as an act of targeted violence and they’re trying to still determine a motive. More than 100 interviews have already been conducted.

An FBI evidence response team is still processing the scene.

Grand Blanc Chief William Renye initially said on Monday afternoon that five people were killed and eight were injured. All victims have been accounted for. He later clarified that the five dead included the shooter.

A 21-year-old person is in custody for driving through a barrier, but it is not known if it is related to the shooting.

The motive still is not being released.

Original report: Police said that the man drove his truck into the front of the church’s chapel, got out of the pickup and started shooting, CNN reported.

He then used gas to set the blaze, the AP said.

The Bureau of Alcohol, Tobacco, Firearms and Explosives said that the man, who was identified as Thomas Jacob Sanford, had explosive devices with him, but it is not known if he had used them.

After Sanford left the building, he was chased by police and “engaged in gunfire.” Sanford was dead in the church’s parking lot about eight minutes after police arrived at the church, CNN reported.

While the death toll stood at four on Monday morning, officials said some people are still unaccounted for, the AP reported. They have not been able to provide an exact number of people who are missing, CNN reported.

One person died at the scene of their wounds. Another died at a nearby hospital, the Detroit Free Press reported. The remains of two other people were found inside the church among the debris.

Sanford was a sergeant in the Marines from June 2004 to June 2008, serving in Iraq from August 2007 to March 2008 and was an automotive mechanic and vehicle recovery operator, The Detroit News reported.

No motive has been determined; however, the FBI, which is the lead investigative agency, said it was an “act of targeted violence.”

The shooting came the day after the death of the Church of Jesus Christ of Latter-day Saints’ president, Russel Nelson, CNN reported.

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