The first reported school shooting in what is now the U.S. took place in the 1700s when four Lenape Indians entered a schoolhouse in what is now Greencastle, Pa., and killed the schoolmaster and as many as 10 children, according to

Since that dark day, there have been hundreds of schoolhouse shootings, the most recent on Friday morning, when a gunman entered the Sandy Hook Elementary School in Newtown, Conn., and started shooting. In all, 20 children and six adults were killed. The suspected shooter is also dead, as is another adult at a separate location.

Herewith is a short pictorial history of fatal incidents in U.S. primary and secondary schools since 1989.