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Complete coverage of the attack at a high school outside of Pittsburgh, PA, where a student went on a bloody rampage and knifed 20 people on the morning of April 9, 2014.

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Stabbing-Spree Suspect Included in School Yearbook

Keith Srakocic / AP, file
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Stabbing Suspect Alex Hribal Motivated by Rage and Adrenaline, Criminologists Say

Guard William 'Buzz' Yakshe Back on the Job After Stabbing

Alex Hribal Is Not 'a Loner or a Weirdo,' Lawyer Says

Doctors Operate Again on Teen Nearly Stabbed in Heart

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Stab-Spree Suspect Held in General Population at Juvenile Lockup

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EXCLUSIVE: Girl Tells Stab Victim, 'We're Going to Go to Prom'

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Community Holds Vigil for School Stabbing Victims

Five Questions About Alex Hribal and the Pennsylvania School Stabbings

School Stabbing Spree: 20 Hurt in Pittsburgh-Area Bloodbath

Teen Held on 26 Counts in High School Bloodbath

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Assistant Principal Sam King, Hero in Stabbings, Is 'the Greatest Guy'

Knife Narrowly Misses High School Stabbing Victim's Heart

Student Victim 'Chillin at Children's' After Stabbing

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First Photo Emerges of Teen Suspect in School Stabbing

School Stabbing Suspect 'Did Not Seem Like a Mean Kid'

Rampage at Pa. School Occurs a Year Since Similar Bloody Assault

PA Governor Corbett Statement on High School Stabbing

Student Describes School Terror: 'Someone Is Stabbing People'