Farmer Andrew Kehoe sets off two explosions at a school killing himself, 6 adults, and 38 children.
Convict Paul Orgeron exploded a suitcase of dynamite on a playground. He killed himself, 2 adults, and three children.
Jason Robinson, 16, was stabbed to death in his class room by 3 teenage attackers who invaded the class room.
David Taber invaded a middle school and took 3 hostages. Then shot and killed the nurse Carol Day. He was found not guilty due to insanity.
Two masked gun men killed Damion Blocker in a stairwell. Darrick Evans, 16, was given a sentence of 41 years to life in prison.
Michael Carneal, 14, opened fire on a school prayer group and killed 3 girls. He is serving life in prison.
Eric Harris and Dylan Klebold, kill 12 students and one teacher before committing suicide in the school library.
Nathaniel Brazill, 13, was sent home for misbehaving. He returned to school and shot his teacher.
Charles "Andy" Williams, 15, kiled two classmates and injures 13 others.
A gunman opened fire in an elementary school in Newtown, killing 30 people, most of them children.