A Salvation Army disaster services vehicle drives past a school bus onto the campus of the Franklin Regional School District where several people were stabbed at Franklin Regional High School, Wednesday, April 9, 2014 in Murrysville, Pa., near Pittsburgh. The suspect, a male student, was taken into custody and being questioned. (AP Photo/Keith Srakocic) (April 10, 2014 11:34 AM)
Officials say the teen charged in the Pennsylvania high school attack used common kitchen knives and probably worked alone.
Alex Hribal, 16, used two kitchen knives when he stabbed and slashed his way through the halls of Franklin Regional Senior High School, police say.
A total of 21 students and a security guard were wounded before an assistant principal and a student tackled Hribal.
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