Two students at a middle school in Spring Valley were arrested for bringing a BB pistol onto the campus Tuesday, police said.

The presence of the pellet gun on the grounds of STEAM Academy, a fourth- through eighth-grade campus on Leland Street, was reported shortly after 11:30 a.m. Tuesday, according to the San Diego County Sheriff's Office.

Teachers secured all pupils in their classrooms while deputies investigated the campus, Sgt. Matthew Moser said.

"While this was happening, sheriff's deputies contacted several students who had been observed with the (suspected) firearm," Moser said. "A search of the students and their backpacks revealed a black metal BB gun in a backpack belonging to one of them."

Two of the pupils were arrested on suspicion of possession of a weapon on school gr

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