NASHVILLE, Tenn. (WKRN) – One woman was killed and eight people, including the gunman, were injured in what officials are calling a “mass casualty” incident at a church in Antioch Sunday morning.

Metro police responded to the Burnette Chapel Church on Pin Hook Road at 11:15 a.m.

The preliminary investigation shows the gunman–identified as Emanual Kidega Samson, 25–arrived to the church in a blue SUV wearing a mask.

Metro police said he immediately confronted a woman outside the church, shooting her at least one time, killing her on the scene. Her name has yet to be released.

Samson is accused of then going inside the church and opening fire. Six people were injured. Those victims were identified as the minister, Joey Spann; his wife, Peggy Spann; William Jenkins, 83; his wife Marlene Jenkins, 84; Linda Bush, 68; and Katherine Dickerson, 64.

Police spokesman Don Aaron said the usher of the church—identified as 22-year-old Robert Engle—then confronted the gunman and was pistol-whipped, receiving a “significant injury to his head.”

At some point during the confrontation, authorities say the gunman then shot himself, but it’s unclear if it was intentional.

Aaron said the usher, who has a valid carry permit, then went out to his car and retrieved his own gun, holding it on the gunman until police arrived. Police described Engle as “extraordinarily brave” for his actions.

Five of the shooting victims as well as the gunman were taken to Vanderbilt University Medical Center for treatment. As of 3:30 p.m., Minister Spann was listed as critical while everyone else was considered stable.

The usher and the final shooting victim were taken to TriStar Skyline Medical Center where they were last listed as stable.

Officials at Nashville Christian School identified the minister as one of their Bible teachers and coaches. The school released the following statement:

As you may already know, one of our Bible teachers, Joey Spann, and his wife were both injured in the church shooting this morning at Burnette Chapel Church in Antioch. We do not have any additional information at this time but want to boldly ask you to pray. Please lift up Coach Joey Spann and his wife Peggy and all who have been injured or impacted by this tragic event. We will keep you informed when we have more information. Thank you for being a part of our family of faith and for interceding on behalf of the Spanns.

Church members who were not injured were still being interviewed by officers at the scene hours later.

An area was also set up for family members to meet up with the relatives who were at the church at the time of the shooting. This area was set up at Beautiful Gate Church located at 12316 Old Hickory Boulevard.

Roads around the church were shut down as the investigation continues, including La Vergne Couchville Pike off Old Hickory Boulevard, and Hobson Pike.

Nashville’s Mayor Megan Barry released a statement  that says “this is a terrible tragedy for our city.” She continued:

My heart aches for the family and friends of the deceased as well as for the wounded victims and their loved ones. Their lives have been forever changed, as has the life of their faith community at Burnette Chapel Church.  My administration, especially the Metro Nashville Police Department, will continue to work with community members to stop crime before it starts, encourage peaceful conflict resolution, and promote non-violence.