A 13-year-old boy in Washington state was arrested over the weekend after authorities were tipped off about his “school shooter ideations,” his 23 guns and boxes of ammunition, said the Pierce County Sheriff’s Office.

Deputies executed a seizure of person warrant at the boy’s home at around 1 a.m. Saturday, taking him, numerous guns, ammo magazines with “school shooter writings” on them, and clothes and writing that support a “mass shooting scenario,” the sheriff’s office said in a release.

In total, deputies found 23 guns, many of which were wall-mounted or otherwise readily available, as well as boxes of ammunition, the sheriff’s office said in an update Monday. 

Some of the guns included 3D-printed parts, Deputy Carly Cappetto told ABC News.

The boy appeared in court Monday and pleaded not guilty to multiple charges, including one count of a threat to bomb or injure property and three counts of unlawful possession of a firearm, according to Seattle’s KOMO-TV.

The sheriff’s office didn’t name the accused boy but said he was last enrolled in school in 2021 as a student in the Franklin Pierce School District. 

Other pieces of evidence found in the home showed that the teen was obsessed with previous school shooters.

The sheriff’s office said that investigators do not know who or what the boy was intending to target in the attack that they accused him of planning.

Deputy Cappetto told ABC News that authorities haven’t pressed charges against the boy’s parents.

His mother, who didn’t provide her name, told KOMO-TV that her son just wanted to “be cool” among peers, and his father told the TV station that the charges were overblown and that the boy didn’t want to harm anybody.

• Brad Matthews can be reached at bmatthews@washingtontimes.com.