[0003]

>Since 1996, there have been 16 multiple victim shootings in schools, or incidents involving 4 or more victims and at least 2 deaths by firearms, excluding the assailant.

17.

Literally happening just as this was posted: https://www.wxyz.com/news/police-responding-to-reports-of-sh...

Edit: Actually this may or may not meet the definition since their definition requires 4 or more casualties. Still.

[cimmanom]

IIRC there was a wave of school shootings in 1992-96, almost a dozen total; Columbine was the worst of them in terms of casualties, but in some ways just the culmination of a pattern. I don't know why you would start counting _after_ 1996.

[Torgo]

New York was putting metal detectors into schools in the 1980's. They were for gangs, but I guess a school shooting is a school shooting.