A 13-year-old boy has been arrested after police found a collection of guns and "mass shooting scenario" writings at his Washington state home, authorities said. 

The case began on Friday afternoon when police were notified about the boy, who allegedly had "school shooter ideations," "was making threats to kill” and said he had access to guns, according to the sheriff's office in Pierce County, which encompasses Tacoma.

Police searched the boy’s home early Saturday morning. The sheriff's office said authorities found a "large quantity" of secured and unsecured guns; "loaded magazines with school shooter writings on them;" and clothes and writings that reinforce a "typical mass shooting scenario."

The teenager was arrested on unspecified charges, authorities said.

The boy is not currently enrolled in any school district, authorities said, noting that he last attended the Franklin Pierce School District in 2021.