When police arrested a 13-year-old boy in Washington state last week accused of making threats to kill, they found he had “everything ready to go to commit a mass shooting” – including a trove of more than 20 guns in his home.

He was arrested after the Pierce County Sheriff’s Office received information Friday from an internet watch group that reports threatening online posts, Deputy Carly Cappetto told CNN.

“After reviewing the suspect’s social media posts, it was warranted to immediately move forward with an arrest,” Cappetto said. Authorities believe the boy had “school shooter ideations.”

When a SWAT team descended on the boy’s home, located in a suburban area of Parkland, Washington, around 1 a.m. Saturday, they found a collection of 23 firearms, several boxes of ammunition, loa

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