franklinRegionHS1MURRYSVILLE, Pa. (AP) – A Pennsylvania high school senior says he had just arrived at school Wednesday when he saw “blood all over the floor” and a wounded student screaming for help, with blood pouring from a stab wound in his stomach. According to police, a 16-year-old who was armed with two knives went on a rampage, stabbing and slashing other students before he was eventually subdued by a school police officer and an assistant principal. The police officer and 19 students were injured, but hospital officials say all are expected to survive.