Using the database at ShootingTracker.com, our colleague Christopher Ingraham has documented the startling frequency of events involving multiple shooting injuries. The Post's graphics team, meanwhile, has worked with reporters to create an interactive documenting when and where people were killed by law enforcement.
All of which allows us to fairly easily present the data in a different way: geographically.
The ShootingTracker data catalogs news reports of incidents in which four or more people were shot. That's happened 207 times in 2015, as of Monday afternoon. (An important qualification, since the figure changes frequently.) In these incidents, 267 people have been killed and 761 wounded. About 400 of those in the latter category were hit by bullets at incidents where no one was killed.
The deadliest incidents are ones you've heard of: nine dead in Waco (the biker brawl) or in Charleston, South Carolina. Other incidents are less familiar, like the killing of five people in Montana last month. Big cities have had a number of mass shootings. In Chicago, 21 people have been injured and two killed in five incidents.
Police killings have occurred in nearly every state across the country. Here, we've shown the killing cumulatively, showing that, for example, police have shot and killed seven people in Oklahoma City so far this year: two in February, one in March, one in April, and three in July.
What's missing from this series, of course, is a map of all of the shooting incidents that don't involve police and affected one to three people. That map, we suspect, would show an indistinguishable red blot on the United States.