OXFORD TOWNSHIP, Mich. (AP) — A teenager accused of killing four students at a Michigan high school was called to the office before the shooting, but “no discipline was warranted,” the superintendent said Thursday in his first extended remarks since the tragedy.

Tim Throne, leader of Oxford Community Schools, said Oxford High School looks like a “war zone” and won’t be ready for weeks. But he repeatedly credited students and staff for how they responded to the violence Tuesday.

“To say that I am still in shock and numb is probably an understatement. These events that have occurred will not define us,” Throne, grim-faced and speaking slowly, said in a 12-minute video.

Ethan Crumbley, 15, has been charged as an adult with two dozen crimes, including murder, attempted murder and terrorism, for the shooting at the Oakland County school, roughly 30 miles north of Detroit.

“I want you to know that there’s been a lot of talk about the student who was apprehended, that he was called up to the office and all that kind of stuff. No discipline was warranted,” Throne said. “There are no discipline records at the high school. Yes, this student did have contact with our front office, and, yes, his parents were on campus Nov. 30.”

Throne said he couldn’t immediately release additional details. Sheriff Mike Bouchard has said Crumbley’s classroom behavior was a concern on the day of the shooting.

In his remarks, the superintendent said he asked the Sheriff’s Office to release school video from Tuesday publicly.

“I want you to be as proud of your sons and daughters as I am,” Throne said.

Earlier Thursday, a prosecutor repeated her criticism of Crumbley’s parents, saying their actions went “far beyond negligence” and that a charging decision would come by Friday.

“The parents were the only individuals in the position to know the access to weapons,” Oakland County prosecutor Karen McDonald said. The gun “seems to have been just freely available to that individual.”

Four students were killed and seven more people were injured. Three were in hospitals in stable condition.

The semi-automatic gun was purchased legally by Crumbley’s father last week, according to investigators.

Parents in the U.S. are rarely charged in school shootings involving their children, even as most minors get guns from a parent or relative’s house, according to experts.

No Michigan law requires gun owners to keep weapons locked away from children. McDonald, however, suggested there’s more to build a case on.

“All I can say at this point is those actions on mom and dad’s behalf go far beyond negligence,” she told WJR-AM. “We obviously are prosecuting the shooter to the fullest extent. There are other individuals who should be held accountable.”

Later at a news conference, McDonald said she hoped to have an announcement “in the next 24 hours.” She had firmly signaled that Crumbley’s parents were under scrutiny when she filed charges against their son Wednesday.

Jennifer and James Crumbley did not return a message left by The Associated Press.

Wednesday, the sheriff disclosed that the parents met with school officials about their son’s classroom behavior just a few hours before the shooting.

Crumbley stayed in school Tuesday and later emerged from a bathroom with a gun, firing at students in the hallway, police said.

“Should there have been different decisions made?” McDonald said when asked about keeping the teen in school. “Probably they will come to that conclusion. … I have not seen anything that would make me think that there’s criminal culpability. It’s a terrible, terrible tragedy.”

William Swor, a defense lawyer not involved in the case, said charging the parents would require a “very fact-intensive investigation.”

“What did they know and when did they know it?” Swor said. “What advance information did they have about all these things? Did they know anything about his attitude, things of that nature. You’re talking about a very heavy burden to bring on the parents.”

Just over half of U.S. states have child access prevention laws related to guns, but they vary widely. Gun control advocates say the laws are often not enforced and the penalties are weak.

“Our laws haven’t really adapted to the reality of school shootings and the closest we have are these child access prevention laws,” said Kris Brown, president of the Brady gun control advocacy group.

In 2000, a Flint-area man pleaded no contest to involuntary manslaughter and was sentenced to two years in prison. A 6-year-old boy living with him had found a gun in a shoebox and killed a classmate at school.

In 2020, the mother of an Indiana teen was placed on probation for failing to remove guns from her home after her mentally ill son threatened to kill students. He fired shots inside his school in 2018. No one was injured, but the boy killed himself.

In Texas, the parents of a student accused of killing 10 people at a school in 2018 have been sued over his access to guns.

Meanwhile, dozens of schools in southeastern Michigan canceled classes Thursday due to concerns about threatening messages on social media following the Oxford shooting. Others planned to join them and close on Friday.

“We know from research and experience that learning is nearly impossible when students and staff do not feel safe,” Grosse Pointe Superintendent Jon Dean told families.

Bouchard said no threats in Oakland County were found to be credible. Just to the north in Genesee County, a Flint teenager was charged with making a false threat when she recorded a video while riding a school bus and posted it online.

“If you’re making threats, we’re going to find you,” Bouchard said. “It is ridiculous you’re inflaming the fears of parents, teachers in the community in the midst of a real tragedy.”