There have been at least 50 school shootings in the United States so far this year, as of September 19. Thirteen were on college campuses, and 37 were on K-12 school grounds. The incidents left 24 people dead and at least 66 other victims injured, according to CNN’s analysis of events reported by the Gun Violence Archive, Education Week and Everytown for Gun Safety.
https://www.cnn.com/us/school-shootings-fast-facts-dg/index.html
Let me make two notes:
A “school shooting” is any time a gun goes off on any school grounds. You can go to the elementary soccer field and put one in the ground at midnight, “school shooting”. Mass shootings are not what you picture in your mind when that word comes up.
https://imgur.com/2prD6rU
The Gun Violence Archive and Everytown for Gun Safety are two of the most biased sources related to guns.