Utah High School Shocked by Sophomore's Stabbing Spree

The alleged stabber, a straight-A student, attacked five classmates before stabbing himself in the throat.
1:16 | 11/16/16

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Transcript for Utah High School Shocked by Sophomore's Stabbing Spree
And next here, to terrifying moments inside an American high school today. A stabbing spree, several injured. A 16-year-old student from Utah going on the attack. The school put on lockdown. Authorities say the suspect is a straight-a student. ABC's Clayton Sandell is in Utah. Reporter: Tonight, this Utah high school is reeling after a stabbing spree, allegedly carried out by a straight-a student. Mountain view high school four possible stab victims. Reporter: 7:47, a 16-year-old sophomore boy allegedly attacks five classmates. Coaches and school staff come running to help. Actually had boxed the suspect into a little bathroom area, staff members did place themselves in harm's way. Reporter: A police officer assigned to the campus shooting the suspect with a taser. Suspect is down. This has been alarming today and kind of a wakeup call. Reporter: The suspect also stabbed himself in the throat. Tonight, the five victims are recovering. Their conditions, fair to critical. And David, you can see, investigators are still on the scene here, and tonight, the big question is why. Police have still not mentioned a motive, and the school district here items us the student had no history of trouble. David?

This transcript has been automatically generated and may not be 100% accurate.

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