2 students, teacher injured in stabbing at Black Hawk Middle School in Warrenton, Missouri; student in custody: police

All victims are stable, police said.

WARRENTON, Mo. -- Two students and a teacher were injured in a stabbing at a middle school in Missouri on Thursday, police said.

The suspect -- a student -- is in custody, police said.

The incident occurred at Black Hawk Middle School in Warrenton, located nearly 60 miles northwest of downtown St. Louis, according to police. First responders were dispatched at approximately 8 a.m. local time, according to the Warren County Ambulance District.

A student was transported via medical helicopter from the scene to a children's hospital in serious condition, according to information released by police and EMS. The teacher was also transported to a local hospital via ambulance in serious condition, according to authorities.

The other injured student sustained "superficial wounds," police said. All victims are stable, police said.

Shortly after the school was placed on lockdown, officers located the suspect, who had allegedly fled the scene, and took the student into custody without incident, police said.

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Police did not release any additional details on the incident, saying more information will be shared "as it becomes appropriate and will not compromise the investigation or the privacy of those involved."

A sixth grader at Black Hawk Middle School, told ABC St. Louis affiliate KMOV that after hearing the lockdown announcement, his classroom turned off the lights, locked the door and went into a corner.

"We just sat there quietly," he told the station while standing next to his dad. "I just wanted all my friends to be OK and everyone else to be OK."

Black Hawk Middle School serves students in grades six through eight.

All sports at the middle school were canceled for the day, and all schools in the district were dismissed early Thursday, the school district said.

"We are working closely with school administrators and other emergency response agencies to ensure the safety of everyone involved and to assist with the ongoing investigation," the Warrenton Police Department said in a statement.