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A parent consoles their child as the leave Franklin Regional High School after more than a dozen students were stabbed by a knife wielding suspect at the school on Wednesday, April 9, 2014, in Murrysville, Pa., near Pittsburgh. The suspect, a male student, was taken into custody and is being questioned. (AP Photo/Tribune Review, Sean Stipp)  PITTSBURGH OUT
A parent consoles their child as the leave Franklin Regional High School after more than a dozen students were stabbed by a knife wielding suspect at the school on Wednesday, April 9, 2014, in Murrysville, Pa., near Pittsburgh. The suspect, a male student, was taken into custody and is being questioned. (AP Photo/Tribune Review, Sean Stipp)  PITTSBURGH OUT

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    20 wounded in school stabbing

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20 wounded in school stabbing

Teenage boy wielding two knives went on a stabbing rampage at his Pennsylvania high school. CNN's Pamela Brown reports.

20 wounded in school stabbing

Teenage boy wielding two knives went on a stabbing rampage at his Pennsylvania high school. CNN's Pamela Brown reports.