SEATTLE — A 13-year-old boy who idolized school shooters had access to at least 20 firearms and repeatedly posted online about wanting to carry out a mass killing, according to new charging papers.

Pierce County sheriff’s deputies arrested the teen at his Parkland-area home around 1 a.m. Saturday. Investigators received a tip from a consultant with the National Sheriffs’ Association about the teen’s social media posts where he brandished guns and detailed his desire to kill others, according to police reports.

The incident checked all the boxes of a mass shooter, but we were able to prevent it from happening,” sheriff’s spokesperson Carly Cappetto said Monday. Any intended target remains unknown, but Cappetto said deputies prevented a tragedy.

Prosecutors charged the teen with three cou

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