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

There have been 170 shootings on school campuses in the U.S. since 20 children and six adults were killed at Sandy Hook Elementary school in Newtown, Conn. on Dec. 14, 2012 according to Everytown For Gun Safety, an advocacy group. Incidents were classified as school shootings when a firearm was discharged inside a school building or on campus, as documented in news accounts. This includes events that did not target students or teachers, like suicides, misfires and other activity. Incidents in which guns were brought into schools but not fired, or were fired off school grounds after having been possessed in schools, were not included.

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Credits: Priya Krishnakumar and Len DeGroot. Sources: Everytown for Gun Safety, Times reporting.