Scale of gun violence at US schools revealed by database

* A gun is fired on school grounds nearly twice a week* Incidents include suicides, homicides and accidentsPolice officers take part in active shooter response training exercise at Fountain middle school in Fountain, Colorado, in June 2017. Photograph: Dougal Brownlie/APA gun is fired on a school campus in America nearly twice a week. Suicide, homicides, a police shooting, attacks on students by other students: more than once a month this past year, gunfire on American school and university camp