Ключевые слова: armed, assassin, attack, attacker, background, backpack, bag, bandit, blackboard, children, class, classroom, concept, control, crime, criminal, crossing, danger, dangerous, delinquency, felony, firearm, gang, gangster, gun, gunman, high, justice, juvenile, killer, mass, murder, pistol, public, risk, room, school, security, shoot, shooting, sign, stop, student, supplies, table, terrorist, threat, violence, weapon, zone,