The 12-year-old also is accused of taking the .38-caliber gun onto the grounds of Nisqually Middle School on Monday and showing it to students.
The News Tribune reported that the boys were arrested Wednesday and ordered held in juvenile detention on suspicion of unlawful possession of a firearm. Both have criminal histories that include assault.
Deputy Prosecutor Wayne Graham said authorities are still trying to determine how the boys got their hands on the gun.
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