The U.S. has had more mass shootings than days in 2015. 352 shootings in 336 days. (Video via NBC)
That's from ShootingTracker, a group that tracks and reports on gun violence. (Video via KMGH)
It defines "mass shooting" as four or more people injured with a gun. That includes the gunman. (Video via ABC)
ShootingTracker says 2014 had 336 mass shootings. That's for the entire year. (Video via MSNBC)
This video includes music from Chris Zabriskie / CC BY 4.0.
