Mass killings database reveals trends, details and anguish in every US event since 2006

The horror and tragedy of mass shootings in American schools, churches and other public places capture the nation's attention. But these are only part of the larger violence of mass killings – deaths by guns, knives, fires, vehicles and other weapons in public and in private – that plague the U.S., research shows. 

Over the past decade, USA TODAY, along with Northeastern University and The Associated Press, has been tracking all mass killings in the United States. When it comes to gun violence, our database is narrower than other tracking sites, such as...