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Using data from shootingtracker.com, which is maintained by a Reddit group, updated map that documents all the U.S. mass shootings in 2015 alone. The group defines mass shootings as incidents when at least four people are killed or wounded, including the gunman.
Via www.pbs.org/newshour/rundown/heres-a-map-of-all-the-mass-shootings-in-2015/
