This made me think of the Saragosa, where an F4 killed 30 people in a town of some 400 in 1987. Many of these events have tragic stories attached, and this one is remembered as such because of the smallness of the community; everyone knew each other, most were related. Most of those killed lost their lives while attending the high school graduation ceremony.

The wiki story is pretty good and has links to other tornados, including the F5 that hit Lubbock in 1970. Afterward, the sheriff announced that looters would be shot on sight.