Six students injured at Heritage High School by Thomas Solomon, 15, who was reportedly depressed after breaking up with his girlfriend.
Mount Morris Township, Mich. 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.
Williamsport, Pa. Elizabeth Catherine Bush, 14, wounded student Kimberly Marchese in the cafeteria of Bishop Neumann High School; she was depressed and frequently teased.
Tucson, Ariz. Robert S. Flores Jr., 41, a student at the nursing school at the University of Arizona, shot and killed three female professors and then himself.
New Orleans, La. One 15-year-old killed, and three students wounded at John McDonogh High School by gunfire from four teenagers (none were students at the school). The motive was gang-related.
Red Lake, Minn. Jeff Weise, 16, killed grandfather and companion, then arrived at school where he killed a teacher, a security guard, 5 students, and finally himself, leaving a total of 10 dead.
Essex, Vt. Christopher Williams, 27, looking for his ex-girlfriend at Essex Elementary School, shot two teachers, killing one and wounding another. Before going to the school, he had killed the ex-girlfriend's mother.
Blacksburg, Va. A 23-year-old Virginia Tech student, Cho Seung-Hui, killed two in a dorm, then killed 30 more 2 hours later in a classroom building. His suicide brought the death toll to 33, making the shooting rampage the most deadly in U.S. history. Fifteen others were wounded.
DeKalb, Illinois Gunman killed five students and then himself, and wounded 17 more when he opened fire on a classroom at Northern Illinois University. The gunman, Stephen P. Kazmierczak, was identified as a former graduate student at the university in 2007.
Madison, Alabama At Discovery Middle School, a ninth-grader was shot by another student during a class change. The boy, whose name was not released, pulled out a gun and shot Todd Brown in the head while walking the hallway. Brown later died at Huntsville Hospital.
Omaha, Nebraska Two people were killed and two more injured in a shooting at Millard South High School. Shortly after being suspended from school, the shooter returned and shot the assistant principal, principal, and the school nurse. The shooter then left campus and took his own life.
December 14, 2012
Newtown, Conn. Adam Lanza, 20, killed 20 children and six others at the Sandy Hook Elementary School. He killed his mother, Nancy, at her home prior to the massacre at the school. Lanza committed suicide after the rampage. The shooting was the second deadliest in U.S. history, behind the 2007 shooting at Virginia Polytechnic Institute that claimed 32 people.
See also Milestones in Federal Gun Control