| http://www.w3.org/ns/prov#value | - MURRYSVILLE, Pa. (AP) ??? Flailing away with two knives, a 16-year-old boy with a blank expression stabbed and slashed 19 students and a police officer in the crowded halls of his suburban Pittsburgh high school Wednesday before an assistant principal tackled him.At least five students were critically wounded, including a boy who was on a ventilator after a knife pierced his liver, missing his h
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