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Slashed 21 students as a school security guard. it all began at the senior high science wing. he had a blank expression on his face and he choose his victims at random. many students still at their lockers as they were attacked. >> i walked into school and i saw kids running. i was told to get out of there as quickly as possible. >> assistant principal sam king tackled him with the help of a security guard and another student. >> mr. king immobilized him, he pinned him down i jumped on top of him as well and held down his wrist and arms tried to keep the knife stationary. >> helping to get peo...

No one knew what to do. it -- it's unbelievable. no one knew that it was happening. it -- it -- >> reporter: police say the assailant was 16-year-old sophomore alex hribal. he ran through the halls wielding two eight to ten-inch knives. 22 people were stabbed, a security guard and 21 students. >> there was blood right where the double doors are, all over the wall. >> reporter: the school's assistant principal, sam king, is being called a hero for tackling the suspect and stopping his spree. >> mr. king immobilized him. he pinned him down. i jumped on top of him, as well, and just held down his...

Spree inside his pennsylvania high school. police are investigating a phone call that 16-year-old alex hribal made on tuesday night threatening an older classmate. now classmates say that he was constantly bullied. bullied. he has b an it left 21 students and a security guard hurt. being hailed a hero this morning, the assistant principal, sam king, who confronted the teenager, eventually tackling him. >> mr. king immobilized him, he pinned him down. i jumped on top of him as well and held down his wrests and arms and tried to keep the knife stationary. >> the suspect's father is speakering ou...