^1991, Luby's Massacre (https://en.wikipedia.org/wiki/Luby%27s_shooting)
If anyone feels like researching this for positive gain:
US Mass Shootings, 1982-2019: Data From Mother Jones’ Investigation,
https://www.motherjones.com/politics/2012/12/mass-shootings-mother-jones-full-data/
(1 vote)