A Guide to Mass Shootings in America | Mother Jones The article has an interactive map showing all the locations as well as a time line showing each incident. From the article: A Guide to Mass Shootings in America There have been at least 62 in the last 30 yearsand most of the killers got their guns legally. Weapons: Of the 142 guns possessed by the killers, more than three quarters were obtained legally. The arsenal included dozens of assault weapons and semiautomatic handguns. (See charts below.) Just as Jeffrey Weise used a .40-caliber Glock to slaughter students in Red Lake, Minnesota, in 2005, so too did James Holmes, along with an AR-15 assault rifle, when blasting away at his victims in a darkened movie theater. In Newtown, Connecticut, Adam Lanza wielded two handguns and a .223 Bushmaster semiautomatic assault rifle as he massacred 20 school children and six adults. The killers: Half of the cases involved school or workplace shootings (12 and 19, respectively); the other 31 cases took place in locations including shopping malls, restaurants, government buildings, and military bases. Forty four of the killers were white males. Only one of them was a woman. (See Goleta, Calif., in 2006.) The average age of the killers was 35, though the youngest among them was a mere 11 years old. (See Jonesboro, Ark., in 1998.) Explore the map for further detailswe do not consider it to be all-inclusive, but based on the criteria we used to identify mass murders, we believe that we've produced the most comprehensive rundown available on this particular type of traumatic violence. (Mass murders represent only a sliver of America's overall gun violence.) For a timeline listing all the cases on the map, including photos of the killers, jump to page 2.) and my favorite comment from FelixZD : "It looks like you should stay out of Finland - or go there heavily armed. 5 million people and 3 listed incidents. The US, with 300 million people only had 18. That's 1 per 16..17 million people. And people think Americans are crazy. The UK beats the US at 1 per 12 million people. Gad! The place is overrun by gun nuts. Norway slaughters the US. They got 1 from their paltry 5 million people. So, maybe it's the latitude that causes these mass murders. Ban Northern latitudes! But wait! Germany? Pffft. Only 2 out of 80 million. What's with that country? No crazies? Switzerland has 1 for their 8 million people. But everyone there packs heat, so you'd expect them to score high on mass murderers, right? Finally, Australia and New Zealand both have the US beat. Oz posted 2 for 23 million, oddly similar to the home country. And the Kiwis? 1 from 4 or 5 million. But, can you blame them? Beautiful scenery only goes so far. Gosh I'm glad I live in the States where this sort of thing is rare."