The longest-running and most comprehensive source of data on mass killings reveals that 2,646 people in the United States have lost their lives in 504 events over the past 17 years. The Associated Press/USA TODAY/Northeastern University Mass Murder Databasemaintained by James Alan Fox, professor of Northeast America, was made available to the public on Thursday.
It refers to any mass murder, with all weapons and means, in which four or more people (excluding the perpetrator) are killed within a 24-hour window. Fox's database provides a different perspective than other gun-related websites, including the Gun Violence Archive, which includes shootings with four or more victims, most of whom survive their injuries. Less than 5% of mass shootings in the Gun Violence Archive are mass murders.
