“A study published Tuesday in the Journal of the American Medical Association found that semi-automatic assault rifles were used in only about 25 percent of such U.S. incidents from 2000 to 2017. The rest of the time, firearms including handguns, rifles and shotguns were the weapon of choice.

“The Federal Bureau of Investigation defines an active shooter event as “a situation in which an individual is actively engaged in killing or attempting to kill people in a confined or populated area.” The researchers used FBI data on 248 U.S. shootings, as well as legal filings and media reports, to determine what weapons were used. The study may raise questions about whether calls to restrict only semi-automatics in the wake of such attacks are missing the bigger picture, one in which other weapons are used three times as often—albeit with less carnage.” – Bloomberg in Fortune, Assault Rifles are Linked to Only 25% of ‘Active Shooter’ Events)