article_snippet.sent: The new study, by independent political magazine Mother Jones, was spawned by the mass shooting in Aurora, Colorado, in July 2012 during a midnight screening of The Dark Knight rises, in which 12 people were killed and 70 injured.
article_snippet.sent: The investigation subsequently expanded to account for all the victims of gun-related violence in the U.S. based on yearly figures from 2012.
article_snippet.sent: At least 750,000 Americans have been injured by guns over the last 10 years.
article_snippet.sent: While gun-related deaths seem to be decreasing, with 33,000 each year, gun-related violence is increasing, with 80,000 injured in 2012.
article_snippet.sent: Mother Jones reported the rise of gun-related violence to be up 11 percent since 2011.
article_snippet.sent: Although homicides are on the decline across the US, Mother Jones found 80,000 people were injured by guns in 2012.
article_snippet.sent: This includes the massive increase in security at schools across America since the Columbine High School massacre in 1999.
article_snippet.sent: The federal government has spent over $811 million equipping schools with security guards and providing other surveillance-based equipment.
article_snippet.sent: Adding up: The Mother Jones study used 2012 data of  homicides, suicides, police shootings, and massacres to quantify the effects of gun violence .