Late Sunday, the Civil Rights division of the FBI's Memphis field office announced it was opening an investigation into the shooting.
The FBI and USA attorney's office are now both involved in the case.
"We kindly ask that no one attempt to enter the building at this time", the church wrote in a Facebook update Monday morning.
The fire department said that all the wounded except one are over 60 years of age and were taken to local hospitals.
The church's minister, Joey Spann, and his wife, Peggy, were among the injured, Nashville Christian School said in a post on Facebook. He was later released and was expected to appear before a judge late Sunday night.
When police arrived at the church, the engine of the shooter's vehicle was still running.
Rosa said the reading that day had been from Luke, Chapter 8, and she recalled the part about a woman who touched Jesus and was cured of bleeding. "It was a good church", said Merritt, 58. He is a legal US resident who came from Sudan in 1996. Nashville has a vibrant Sudanese community, and the city's churches frequently host and help care for refugees. But they had not seen him in a while and did not immediately recognize him because the gunman was masked. Nearly 50 people were inside at the time and the gunman wounded six.
"A very sweet person, a humble person too", said McElroy.
Engle declined an on-camera interview but did send a statement.
Also among the wounded include members Linda Bush, 68, William Jenkins, 83, Marlene Jenkins, 84, Catherine Dickerson, 64, and Robert Engle, 22.
Members of the congregation, still shaken after the shooting, were proud of Engle.
"During the struggle, Samson's gun discharged, striking him in the left chest", the press release said. Once police arrived, they photographed Samson's hand, which was bloodied from punching the television but the girlfriend declined to press charges.
One of the eight people shot in the Nashvilled church has died.
Samson's final post read, "Everything you've ever doubted or made to be believe as false, is real".
The police department said on Twitter that six of the injured were shot and one was pistol-whipped.
"Become the creator instead of what's created".
The first at 10:18am that said "You are more than what they told us". Police said none of the surviving victims suffered life-threatening injuries. The media focused on some weird statements Samson posted on his Facebook page, which were inconclusive and left the police with no known motive for the shooting spree.