in murrysville, pennsylvania. hes has the latest. this happened in a particularly vulnerable time at the school. just the beginning of the day. students were not in the classrooms. they were in the hallways. there were many heros in all of this. two assistant principals who subdued this young man. when they did, he said he wanteded to die. it has happened again. this time a 16-year-old sophomore alex hribal harmed with two eight- to ten-inch kitchen knives. someone yelled, i got stabbed. reporter: stabbing in some cases, slashing classmates and even a school police officer. panic just after 7:00 a.m. i was seeing people getting shoved into lockers. that s whenever the boy ran past me and i saw him tackle someone else. and that s when everyone just started screaming and running out of the door. reporter: police arriving within minutes, the fire alarm sounding. cha chaos. a lot of evidence of blood on the floors in the hallway.
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shaken up this community. and what about the heroes who stopped the attack from getting worse? this could have been so much worse, i know. this could have been. and we heard authorities talk in the press conference that we probably could have seen a lot more injuries or even deaths if there weren t some heroes, some quick-thinking people who jumped into action. we learned that the assistant principal here at the school, sam king tackled the alleged attacker. also, the school resource officer and a security guard known as buzz here at the school also helped and jumped in to subdue the attacker. and we also heard about cafeteria workers, teachers, fellow students coming to the aid of those that were wounded. so certainly a lot of heroes here today. erin? pamela, thank you very much. pamela brown covering that story for us in murrysville. and still to come, the breaking news as investigators pick up two fresh signals that could come from flight 370 s black boxes. and dramatically