Since Sandy Hook, a gun has been fired on school grounds nearly once a week

There have been more than 180 shootings on school campuses that resulted in an injury or death in the U.S. since Dec. 14, 2012, when 20 children and six adults were killed at Sandy Hook Elementary school in Newtown, Conn. Incidents were classified as school shootings when a firearm was discharged inside a school building or on campus, as documented in news accounts. This data is from to Everytown For Gun Safety, an advocacy group, and includes events that did not target students or teachers, like suicides, misfires and other activity.