The US has had more mass shootings than days this year

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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
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This video includes music from Chris Zabriskie / CC BY 4.0.