In June 2013 Think Progress (a political online news source) reported, “The U.S. has averaged over one mass shooting per month for the past four years.”
In February 2014 The Guardian (US Edition) reported, “Gun violence is erupting in America’s schools and colleges at a rate of more than three incidents a month, with thirteen school shootings recorded in the first six weeks of 2014 alone.”
2015 began with a mass shooting sign up.
School Danger (a website) posted a 15-year-old from an Illinois high school sent electronic messages soliciting assistance to carry out a “Columbine-Style shooting” in January. The student was arrested, his home was searched, nothing was found, no charges were filed, and the student agreed to seek help for possible mental illness.