Alex Hribal, the suspect in the stabbings at the Franklin Regional High School near Pittsburgh, is taken from a district magistrate after he was arraigned on charges in the attack on Wednesday, April 9, 2014 in Export, Pa. Authorities say Hribal has been charged after allegedly stabbing and slashing at least 21 people, mostly students, in the crowded halls of his suburban Pittsburgh high school Wednesday. (AP Photo/Keith Srakocic)

Associated Press
Alex Hribal, the suspect in the stabbings at the Franklin Regional High School near Pittsburgh, is taken from a district magistrate after he was arraigned on charges in the attack on Wednesday, April 9, 2014 in Export, Pa. Authorities say Hribal has been charged after allegedly stabbing and slashing at least 21 people, mostly students, in the crowded halls of his suburban Pittsburgh high school Wednesday. (AP Photo/Keith Srakocic)
Alex Hribal, the suspect in the stabbings at the Franklin Regional High School near Pittsburgh, is taken from a district magistrate after he was arraigned on charges in the attack on Wednesday, April 9, 2014 in Export, Pa. Authorities say Hribal has been charged after allegedly stabbing and slashing at least 21 people, mostly students, in the crowded halls of his suburban Pittsburgh high school Wednesday. (AP Photo/Keith Srakocic)
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