These might be handy in the future.
Database about historical violence: cjrc.osu.edu/researchprojects/hvd/europe.html.
On long term trends in violent crimes: Eisner, 2003, Long-Term Historical Trends in Violent Crime. Crime & Just, 30, 83-142. [PDF].
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Published by lankoski
Petri Lankoski, D.Arts, is a Associate Professor in Game Studies at the school of Communication, Media and IT at the Södertörn University, Sweden.
His research focuses on game design, game characters, role-playing, and playing experience. Petri has been concentrating on single-player video games but researched also (multi-player) pnp and live-action role-playing games. This blog focuses on his research on games and related things.
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Petri Lankoski 
Steady flow of mass shootings between 1982 and 2012: http://www.motherjones.com/politics/2012/07/mass-shootings-map