Kid uses shotgun stolen from his foster home to kill a student and principal.
2 kids kill 12 students and 1 teacher. Then commit suicide.
Kid shoots a classmate.
Kid gets sent home for misbehaving and returns and kills his teacher.
Kid kills 2 classmates and injures 13.
Kid kills grandfather, another adult, 4 students, a teacher, and a security officer. Then himself.
Kid kills a girl in the hallway.
Kid kills his principal and vice principal and then himself.
Kid kills 1 and wounds 4
Gunman kills almost 30 people.