The FBI is investigating a violent and deadly attack on a Mormon house of worship in Michigan on Sunday. A gunman drove his pickup truck into a packed service and opened fire on parishioners. Then, he set the building on fire.

The attacker killed at least four people and injured eight others. Officials are still searching for some who are missing after the deadly assault on the church in Grand Blanc, about 50 miles northwest of Detroit.

Grand Blanc Police Chief William Renye said, "We're working tirelessly to find additional bodies. So to answer your question, the entire church has not been cleared because it's a total loss due to the fire."

Hundreds of people were gathered for worship inside the Church of Jesus Christ of Latter-day Saints facility on Sunday morning when the gunman open

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