One woman was killed and seven other people were suffered after a suspect identified as a Sudanese immigrant opened fire at a Tennessee church Sunday, police said, as federal officials told Fox News the FBI will initiate a civil rights investigation into the shooting.

The suspect, 25 -year-old Emanuel Kidega Samson, immigrated from Sudan two decades ago, police said. He’s suspected of bringing two handguns and a mask to the mainly white Burnette Chapel Church of Christ in Antioch, southeast of Nashville, before opening fire just after 11 a.m.

Police identified Emanuel Kidega Samson, 25, as the suspected gunman who opened fire at a church in Antioch, Tennessee, on Sunday. ( Metropolitan Nashville Police Department)

Metropolitan Nashville Police Department tweeted that Samson had been liberated from the hospital and will be charged with slaughter and attempted murder.

An usher, identified as Robert Engle, 22, tackled the gunman at one point and was pistol-whipped, causing “significant harm around his head, ” police added. They said Engle went to his own auto, grabbed a pistol and headed back into the church.

Law enforcement supported Samson is a legal U.S. inhabitant who immigrated from Sudan in 1996.

It was initially reported that the gunman shot himself, although police said it’s unclear whether he hits himself or the gun unintentionally discharged during his scuffle with Engle.

Police said that Burnette Chapel churchgoers distinguished Samson as attending their church one to two years ago, but noted he hadn’t attended services “in quite a while.”

One woman was killed and seven others wounded when a gunman opened fire at the Burnette Chapel Church of Christ on Sunday. ( Metropolitan Nashville Police Department)

The woman who was shot and killed in the church parking lot, identified as Melanie Smith, 39, was walking to her car when she was hit, police said.

The gunman, with his blue vehicle still running in the parking lot, then entered the back of the church and shot six people- three women and three men- who were rushed to the hospital, police said.

Police recognized those being treated at Vanderbilt University Medical Center and in stable conditions as: William Jenkins, 83; Marlene Jenkins, 84; Peggy Spann, 65; and Linda Busch, 68. David Spann, 60, was likewise being treated at Vanderbilt, but was listed as in critical but stable condition.

Katherine Dickerson, 64, was in stable conditions at Skyline Medical Center. Engle was also being treated at Skyline.

Nashville Christian School wrote on Facebook that David Spann, nicknamed Joey, is a Bible teacher at the school, in addition to working as a high school and middle school basketball coach.

Metropolitan Nashville Police Chief Steve Anderson called Engle a “hero” for his actions at the church Sunday.

Several witnesses claimed the shooter wore a “clown mask” when he opened fire, but police said what he wore more closely resembled a ski mask.

Megan Barry, mayor of Metropolitan Nashville and Davidson County, said in a statement that the killing “is a dreadful misfortune for our city. My nerve aches for the family and friends of the deceased as well as for the wounded victims and their loved ones.”

Gov. Bill Haslam added that he and his wife, Crissy, were praying for the victims and “committed to supporting the Antioch community in the consequences of the this tragedy.”

The church has a weekly service starting at 10 a. m. Sunday. The surrounding area was closed off as police analyse the situation.

Fox News’ Jake Gibson and The Associated Press contributed to this report .

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