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Mass shootings in the United States: legality of shooter's weapons, as of June 2018

Number of mass shootings in the United States between 1982 and June 2018, by legality of shooter's weapons

The data displays the number of mass shootings in the U.S. between 1982 and June 28, 2018, by legality of the weapons used by the shooter(s). Between 1982 and June 2018, legally obtained weapons were used in 72 out of 101 mass shootings.

Legally obtained 71
Illegally obtained 15
Unknown/to be determined 12
Some weapons were legally obtained others possibly illegally 1