Authorities say a 15-year-old kid was arrested after three pupils were killed and eight others were injured in a shooting at a high school in Oxford, Michigan, on Tuesday afternoon.

Tate Myre, 16, Hana St. Juliana, 14, and Madisyn Baldwin, 17, were the Oxford High School students slain, according to Oakland County Sheriff Michael Bouchard.

According to Bouchard, eight people were shot, including seven kids and a teacher. Three people have been shot and are in serious condition, including a 14-year-old girl who is on a ventilator following surgery.

He added that a 14-year-old child with a gunshot wound to the jaw and head is in bad condition. Three of the pupils are doing well, and the instructor who was shot has been released.

"I think this is every parent's worst nightmare," said Gov. Gretchen Whitmer, who added that shootings at schools are "a uniquely American problem that we need to address."

"My heart goes out to the families. This is an unimaginable tragedy. I hope we can all rise to the occasion and wrap our arms around the families, the affected children and school personnel, and this community," Whitmer said.

There were multiple other non-life-threatening injuries sustained by people as they were rushing out of the school, Bouchard said. Most were treated and released at a staging area, he said.

The suspect, a sophomore at the school, was taken into custody without incident two to three minutes after authorities responded to the shooting, Bouchard said. His parents have hired an attorney and have not permitted him to talk to police, Undersheriff Michael G. McCabe said.

The suspect is being held at Oakland County Children's Village -- a juvenile detention facility -- and is on suicide watch where he is being checked on every 15 minutes, said David Coulter, the Oakland County executive.