A 13-year-old boy in Pierce County, Washington, has been arrested after deputies seized 23 firearms, explosive-type materials and handwritten notes that allegedly outlined 'mass shooting scenarios'. The teen, who hasn't been named because of his age, pleaded not guilty on Monday to five counts, including four felonies.
The teenager, whose identity has not been released due to his age, was described by authorities as obsessed with past school shooters, including the perpetrators of the 1999 Columbine High School massacre.
