PIERCE COUNTY, Wash. — A hearing will be held Monday morning to determine whether a 13-year-old boy officials believe was plotting a mass shooting before his arrest should remain in custody.

The teen has been held since multiple tips led Pierce County sheriff's deputies to his home in early September, where dozens of guns and writings demonstrated that he planned to carry out an attack. The teen had posted images of himself with firearms on social media, deputies said.

“There’s the belief that he was obsessed, and he was pretty much imitating and doing exactly what he had studied and learned from these other mass shooter incidents,” Pierce County Sheriff's Office (PCSO) Deputy Carly Cappetto said.

Prosecutors have been reviewing evidence for the past few weeks, and a judge will decide

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