[marktwain]

List of Mass Shootings or potential mass shootings stopped by armed citizens:

http://gunwatch.blogspot.com/2012/12/mass-killings-stopped-by-armed-citizens.html

[erlayman]

http://www.slate.com/articles/news_and_politics/explainer/2012/12/can_armed_citizens_stop_mass_shootings_examples_of_armed_interventions.html

Here is another rebuttal to the MJ article.

[TigersEye]

Thanks for the link. That is a good accounting to have at hand.