TACOMA, Wash. (AP) — A 13-year-old boy described by police as obsessed with school shooters was arrested on multiple firearms possession charges and causing a threat after they say they found social media posts about intentions to kill and seized 23 guns and ammunition from his home.

The boy pleaded not guilty to a total of five charges, four of them felonies, in juvenile court on Monday. He was arrested over the weekend in Washington's Pierce County.

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