Students hug at a memorial at Oxford High School in Oxford, Mich., Wednesday. Authorities say a 15-year-old sophomore opened fire at the school, killing four students and wounding seven other people on Tuesday. (AP photo)

OXFORD TOWNSHIP, Mich. — 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 was asking the sheriff’s office to publicly release school video from Tuesday.

“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.

There’s no Michigan law that requires gun owners 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.

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