http://metro.co.uk/2017/10/03/devastating-maps-show-how-many-shootings-have-rocked-us-in-2017-6973992/
There have been more than 46,000 shooting incidents this year already (Picture: gunviolencearchive.org)
More than 11,000 have been killed by gun violence (Picture: gunviolencearchive.org)...
I was just having a google for the Texas Tower shooting
https://en.wikipedia.org/wiki/University_of_Texas_tower_shooting (1966)
and as one of it's recommendations google suggested 'Top 10 American Massacres'.
I eventually found this catagory:-...