The school shootings that have occurred in the United States since 2012 and Newtown have often involved a minor, armed with a gun from home, in a confrontation that began as an argument, according to a new report released by Everytown for Gun Safety and Moms Demand Action for Gun Sense in America.

“The two groups, whose definition of school shootings includes those those involving gang violence, unintentional shootings and suicides, used news accounts to compile a list of 95 shootings that occurred in 33 states; 23 of the incidents resulted in at least one death. All told, the shootings caused 45 deaths and 78 gunshot injuries,” writes USA Today‘s Larry Copeland.

Of the forty K-12 shootings in which the shooter’s age was known, seventy percent were committed by minors. Of the sixteen K-12 shootings involving a firearm whose source could be determined, ten of the shooters said they got their guns from home.

“”School shootings … erode the sense of security we should expect from our educational institutions in this country. Two years ago, the NRA called for arming teachers. That’s their solution — more guns for everyone, everywhere, anytime,” said John Feinblatt, Everytown’s president. “Instead, we can and should do more to prevent gun violence. That’s why we’re fighting for common-sense public safety measures that respect the Second Amendment and keep guns out of the wrong hands.”

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