Two students and one teacher killed, one other wounded when 14-year-old Barry Loukaitis opened fire on his algebra class.
Two students killed and seven wounded by Luke Woodham, 16, who was also accused of killing his mother. He and his friends were said to be outcasts who worshiped Satan.
Four students and one teacher killed, ten others wounded outside as Westside Middle School emptied during a false fire alarm. Mitchell Johnson, 13, and Andrew Golden, 11, shot at their classmates and teachers from the woods.
Six-year-old Kayla Rolland shot dead at Buell Elementary School near Flint, Mich. The assailant was identified as a six-year-old boy with a .32-caliber handgun.
A teenager wounded two students at Martin Luther King Jr. High School.
A 16-year-old on Minnesota’s Red Lake reservation killed his grandfather and grandfather’s girlfriend and then nine people at a local school: five students, a teacher and a security guard.
A 15-year-old student brings two guns to Weston Schools in rural Cazenovia, Wis., and fatally shoots his principal after the principal had given him a disciplinary warning for having tobacco on school grounds.
After sending images of himself to NBC that day, an undergraduate student at Virginia Tech university was responsible for the deadliest lone-gunman shooting in U.S. history, killing 32 students and wounding 25. He later committed suicide.
a 14-year-old shoots a 15-year-old classmate, who later dies of his injuries. Law enforcement cites "bad blood" between the teens
A shooting at a Connecticut elementary school leaves as many as 27 people dead, including 18 children. The gunman is found dead inside the school: Sandy Hook Elementary, in Newtown, Conn.