A teacher and two students were stabbed inside a classroom at Black Hawk Middle School in Warrenton, Missouri, on Thursday morning, November 12, and a male student suspect was taken into custody nearby within minutes, Warrenton police said. The attack happened at about 7:55 a.m., during the first hour of classes, when, according to Warren County R-III Superintendent Gregg Klinginsmith, a student who was late to class stabbed the teacher almost immediately after arriving and then attacked two other students before running from the building. Police said the weapon was a knife with a blade of about 4 to 5 inches. The suspect's identity has not been released, and no charges had been announced by Thursday evening; the allegations have not been tested in any court.

Source: St. Louis Post-Dispatch, Nov. 12, 2026

The Warren County Ambulance District said its crews treated three patients. One student was flown by helicopter to a children's hospital in St. Louis — later identified in local reporting as Cardinal Glennon Children's Hospital — in serious condition, and the teacher was taken by ambulance to a hospital, also in serious condition. The second injured student suffered what police called superficial wounds and was treated and released at the scene.

Source: KMOV First Alert 4 via Gray News, Nov. 12, 2026

By early afternoon the picture had improved. Police said shortly before 1:30 p.m. that the airlifted student was in stable condition, and before 2 p.m. the teacher had been discharged from hospital. No one was killed, and police said there was no continuing threat to the public after the arrest.

Source: KMOV First Alert 4 via Gray News, Nov. 12, 2026

Lockdown, clearing and reunification

The school went into lockdown within minutes, and the district alerted parents that morning. Warrenton police said every classroom had been cleared by 10:41 a.m. School officials set up a reunification process to connect parents with their children, the scene that played out through the late morning outside the school off Highway 47. The Warren County R-III district dismissed all of its schools at about 12:41 p.m. on Thursday, and all Black Hawk Middle School sports were cancelled for the day.

Source: KJLU Radio, Nov. 12, 2026

What officials say — and what is not yet known

Lt. Jason Hanner of the Warrenton Police Department confirmed the weapon was a knife but did not specify what type. Police said there had been no threats reported before the incident. Klinginsmith said the school does not have metal detectors — a detail that is certain to sharpen questions about how the knife got inside and what screening, if any, could have stopped the attack before it began. Police released no information about the suspect beyond saying a male student was in custody, and investigators have not announced a motive.

Source: St. Louis Post-Dispatch, Nov. 12, 2026

One gap the district itself had already identified: Warren County R-III requested Behavior Threat Assessment and Management training last spring, and First Alert 4 reported Thursday that it was still working to determine whether the district had completed that training or whether the state was arranging it. Threat-assessment teams are the model most US school-safety experts recommend — a structured way for schools to act on warning signs before violence — and whether that training was in place before November 12 is now one of the central questions of the review that will follow.

Source: KMOV First Alert 4 via Gray News, Nov. 12, 2026

The town and the school

Warrenton is a town of about 9,600 people in Warren County, roughly 55 miles west of St. Louis. Black Hawk Middle School serves nearly 700 students in sixth, seventh and eighth grades. For a community of that size, a stabbing inside a first-period classroom is a defining event: by mid-morning, parents were converging on the school, law enforcement from across the county was on scene, and a medical helicopter had landed to take a child to St. Louis.

Source: St. Louis Post-Dispatch, Nov. 12, 2026

What happens next

The police investigation is continuing, and the case will move through Missouri's juvenile system, where the suspect's identity and court records are generally kept confidential. Officials still have to answer how a student arrived late to class carrying a 4-to-5-inch blade, whether the threat-assessment training the district requested last spring was ever delivered, and what changes — screening, staffing or reporting — the district and the state will make before anything like this can happen again. Classes resume Friday with counselling available; the injured student's recovery at the St. Louis children's hospital is the update families across Warren County will be watching for first.

Source: KJLU Radio, Nov. 12, 2026