By the time Paul Brunner rolled up in his ambulance to the worst mass shooting in Texas history, the First Baptist Church was a chaotic triage scene. Parents cried and kids screamed, and nearly all the victims appeared to have been hit more than once.

Two of the first four patients the burly volunteer medic loaded into ambulances were children.

"Our inclination is to protect children. The thing is, that wasn't his inclination," Brunner said, referring to the gunman. "He wasn't separating going, 'I'm not going to hurt the kids. I'm going to go after whatever adults wronged me."'

When gunfire tore through the church in tiny Sutherland Springs, killing more than two dozen, the bullets claimed eight children and teenagers who were attending the Sunday service with their families. It was the largest number of children killed in a mass shooting since 20 died at Sandy Hook Elementary School in 2012.

Like that massacre in Newtown, Conn., the fact that the assailant slaughtered defenceless children compounded the anguish. Nearby schools quickly added grief counsellors.

The shooter, Devin Patrick Kelley, had a turbulent and violent past that included a court martial while serving in the air force on charges that he assaulted his then-wife and hit her child hard enough to fracture the boy's skull.

Texas Church Shooting

Joaquin Ramirez checks on the gunshot wound on Rosanne Solis's arm at their home in Sutherland Springs on Tuesday. The two survived the mass shooting. (Jay Janner/Associated Press)

Kelley, who had a rifle and left behind at least 15 empty magazines holding 30 rounds each, died of a self-inflicted gunshot wound after he was chased and shot by bystanders and crashed his car.

Investigators have said the shooting appeared to stem from a domestic dispute involving Kelley and his mother-in-law, who sometimes attended services at the church but was not present on Sunday.

One couple who survived the attack, Rosanne Solis and Joaquin Ramirez, said Kelley went aisle by aisle through the pews and shot crying children at point-blank range.

Authorities put the death count at 26, including the unborn baby of one of the slain women and Annabelle Pomeroy, the 14-year-old daughter of the church's pastor.

Church Shooting Texas

One of teenagers killed was Annabelle Pomeroy, 14, seen in this photo released by the Senguin Independent School District. She was the daughter of the church pastor, Frank Pomeroy, and his wife, Sherri Pomeroy, who were out of town when the shooting occurred. (Seguin Independent School District/Associated Press)

"There were just so many babies in there. It was a church. It was families," said Torie McCallum, the former sister-in-law of Crystal Holcombe, the pregnant woman. "Watching them take person after person after person out was so heartbreaking."

McCallum, who is also a volunteer medic in nearby Floresville, spent 12 hours at the scene Sunday. She identified Crystal and her three dead children — Emily,11, Greg, 13, and Megan, 9.

Another of Crystal's children, seven-year-old Evelyn, ran out of the church to a neighbour's house. She suffered a head contusion, which McCallum thinks may have been caused by her head hitting a pew.

The kids were smart and liked church. Their father died six years earlier, but McCallum was relieved when John Holcombe entered the picture and helped raise them as his own.

CORRECTION Church Shooting Texas

U.S. Vice-President Mike Pence hugs survivor Evelyn Hill in Florseville, Texas, Wednesday. Hill escaped the church but her three siblings and pregnant mother were killed. (Eric Gay/Associated Press)

They called him dad and thrived in the 4-H Club. Emily liked archery while Greg, Evelyn and Megan did karate. Crystal homeschooled the children, and the girls sang in church, where the family got a kick out of how their different voices harmonized.

McCallum said the kids were excited for a new sibling and decided that the baby's name, whether a boy or girl, should be Billy Bob Wigglebottom — which they found hilarious.

The official list of those killed released by Texas authorities Wednesday included Carlin Brite (Billy Bob" Holcombe).

By Wednesday, an online fundraiser had collected more than $72,000 for the family.

First responders devastated

"To see seasoned FBI agents and seasoned paramedics and seasoned law enforcement officers, when you see their eyes red, I feel so awful for all of the people who responded to that scene. Because they should never have to see anything like that, especially with so many children," McCallum said.

One of the wounded children, five-year-old Ryland Ward, was hit multiple times and opened his eyes at the hospital Tuesday for the first time since the shooting, said Leslie Ward, the boy's aunt.

"Seeing the children that were killed. It's one thing to see an adult, but to see a five-year-old, that's tough," Wilson County Sheriff Joe Tackitt said.

Devin Kelley Texas church gunman

Devin Patrick Kelley, 26, of Braunfels, Texas, is shown in this undated Texas Department of Safety driver licence photo. Kelley is said to have turned the gun on himself after a shooting rampage that killed 26. (Texas Department of Safety/Handout via REUTERS)

Alison Gould, 17, returned Wednesday to the church where she had waited hours on Sunday for word about her best friend, Haley Krueger, 16. She got the news she feared later that night.

"I am trying my best to cope. I want to see her really bad, and it's kind of hard because I know that I can't," Gould said. "Me and her mom keep thinking that maybe she's in the hospital, and they just identified her wrong. We're trying really hard."

Brunner, chief of the ambulance service in nearby La Vernia, had been at lunch with his own family when he heard about the shooting.

"You had parents screaming about their kids. They got stuff in front of them that they never imagined they would see in their life," Brunner said. "Not really a war zone, because at least people in a war know they're in the middle of a war. This is just hard to describe."

Problems started in high school

School records show that Kelley had a disciplinary problems in high school.

In fall 2006, Kelley's sophomore year, he was suspended and sent to an alternative school for two months after an unspecified drug-related incident.

He was suspended twice as a junior and three times as a senior for reasons including "insubordination," "profane language/gestures" and "dishonest/false records."

With each passing year at New Braunfels High School, his grades slipped as well, according to the records.

Texas Church Shooting

Crosses bearing the names of the mass shooting victims stand near the First Baptist Church on Thursday. (David J. Phillip/Associated Press)

A B-student overall as a freshman, he failed several classes by his senior year and ended up ranked 260 out of 393 students in his graduating class in 2009. He finished with a 2.3 grade-point average.

The records also listed attention deficit hyperactivity disorder as one of his medical conditions.

A former friend said Kelley asked her for sexual favours and prevented his first wife from communicating with her friends. Kelsey Huckaby told Austin television station KTBC that Kelley was "kind of controlling of his girlfriends" in high school.

Huckaby said she lost contact with Kelley until he responded to a Facebook post she made in April asking for a place to stay for her and her boyfriend. She said Kelley offered to let them stay in a trailer on his property if she performed weekly "sexual favours" for him.

Massacre captured on video

Authorities have reviewed video from inside the church, including footage that shows the assailant shooting victims in the head during Sunday services, a U.S. official said Wednesday.

The official's account of the video is consistent with statements made by survivors of the attack. The official was not authorized to discuss the matter publicly and spoke to The Associated Press on the condition of anonymity.

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A candlelight vigil was observed on Sunday. (Suzanne Cordeiro/AFP/Getty Images)

The same U.S. official confirmed that the attacker's cellphone was an iPhone and that the FBI had not yet asked Apple for help obtaining data from the device.

The church regularly recorded its services, and the footage investigators have seen shows several minutes of the attack because there was "no one to turn it off," according to a law enforcement official who has seen the video. The official also spoke on condition of anonymity because that person was not authorized to speak publicly about an ongoing investigation.

Church Shooting Texas

Carrie Matula embraces a woman after the shooting. Matula said she heard the shooting from the gas station where she works a block away. (Nick Wagner/Austin American-Statesman via AP)

Vice-president, governor attend vigil

On Wednesday, U.S. Vice-President Mike Pence joined Texas Gov. Greg Abbott at a memorial service for the victims of Sunday's massacre.

Pence told the crowd that the slayings were the worst mass shooting at a church in American history and called the gunman "deranged."

"Whatever animated the evil that descended on that small church, if the attacker's desire was to silence their testimony of faith, they failed," the vice-president added.

Abbott began the service by praying "for healing and for help."

The governor said Texans come together at times of crisis and tragedy. "It's what we do," Abbott said. People in the crowd responded "amen."

He also proclaimed Sunday, Nov. 12, a statewide day of prayer.