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    Map: Mass shootings in 2016

    Where mass shootings occurred in 2016

    This map is based on data from the Mass Shooting Tracker, which defines a mass shooting as a single incident in which four or more people are shot, regardless of whether they were killed. The definition allows for the shooter to count toward the four or more threshold. Others define mass shootings differenty. (Note: The size of each dot reflects the number of people who were shot.)

    Matt Rocheleau/Globe Staff

    Globe correspondent Garrett Finucane contributed to this report. Matt Rocheleau can be reached at Follow him on Twitter @mrochele