This chronological list of school shootings in the United States includes any school shootings that occurred at a K-12 public or private school, as well as at colleges and universities, and on school buses. Excluded from this list are the following: 1. * Incidents that occurred during wars 2. * Incidents that occurred as a result of police actions 3. * Murder-suicides by rejected suitors or estranged spouses 4. * Suicides or suicide attempts involving only one person. Shootings by school staff, where the only victims are other employees, are covered at workplace killings.