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Parents and students embrace along School Road near 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
Parents and students embrace along School Road near 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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    La violencia escolar en EE.UU.

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La violencia escolar en EE.UU.

En los últimos años Estados Unidos ha tenido que lamentar decenas de incidentes violentos en las escuelas

La violencia escolar en EE.UU.

En los últimos años Estados Unidos ha tenido que lamentar decenas de incidentes violentos en las escuelas