A 15-year-old Minnesota school student was stabbed to death Friday by another student who was arrested shortly after the attack, police said

Harding High School went into lockdown following the incident at 11:45 a.m. The St. Paul Police Department was called to the school where responding officers found staff members rendering first aid to a 15-year-old boy with stab wounds," St. Paul police Sgt. Mike Ernster said during a news conference.

The teen was taken to the hospital, where he died and a 16-year-old student was taken into police custody. The death was the first homicide in St. Paul in 2023, Ernster said. 

Investigators have not determined a motive for the attack, he said. 

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Minnesota Gov. Tim Walz said he has a child that attends school in St. Paul. 

"As the dad of a St. Paul student, I’m heartbroken for the Harding High School community and the family of a student who lost their life today," he tweeted. "We have offered our full support and have been assured that the area is now secure."

The St. Paul Federation of Educators identified the victim as a 10th grader.

"On a personal level as a teacher and a parent, I'm enraged," union President Leah VanDassor said in a statement posted on Facebook. "I know there have been far too many similar incidents around our country that have left many of us heartbroken and hopeless."

The union asked all staffers to wear the Harding school colors of maroon and gold starting Monday to show support for the community. 

Fox News Digital has reached out to St. Paul Public Schools for comment.