Screenshot/KATU
Police found the weapons in the boy's backpack Wednesday morning, according to KPTV.
Frontier Middle School and a neighboring elementary school were put on lockdown for two hours while police searched the premises. Authorities were operating based on a tip they received about a student bringing ammunition to school, according to KATU.
The 11-year-old is currently being held in a juvenile detention center.
Earlier this week, a young student brought a gun to a Reno, Nev. middle school and shot several people, including a teacher who died. Two injured students are expected to recover.