Tuesday's school shooting in Oregon is the 74th since the beginning of 2013, according to data compiled by Everytown.org, a group that advocates against gun violence. Here is a map of all school shootings during that span, with circles proportional to the number of fatalities. Click or mouse over each circle to view information about the shooting.
Note: Everytown For Gun Safety data included murders, suicides, and incidents that included gunfire but no injuries or deaths.
Related: Photos from Oregon school shooting
Andrew Ba Tran, Luke Knox/Globe staff