"IT IS PERHAPS TOO EASY to forget how many times this has happened. The horrific mass murder at a movie theater in Colorado in July 2012, another at a Sikh temple in Wisconsin that August, another at a manufacturer in Minneapolis that September—and then the unthinkable nightmare at a Connecticut elementary school that December—were some of the latest in an epidemic of such gun violence over the last three decades. Since 1982, there have been at least 70 mass shootings across the country, with the killings unfolding in 30 states from Massachusetts to Hawaii. Thirty-three of these mass shootings have occurred since 2006. Seven of them took place in 2012 alone, including Sandy Hook. A recent analysis of this database by researchers at Harvard determined that mass shootings have been on the rise."
http://www.motherjones.com/politics/2012/07/mass-shootings-map
