OCEANSIDE (CNS) - A 17-year-old high school student was arrested in Oceanside Friday morning for allegedly making threats against others at another local high school he formerly attended and detectives later found replica guns and body armor in his bedroom.

The student, whose name was not released because of his age, was arrested about 9 a.m. after officials at Ocean Shores High School found he had written a note under a false name that included threatening words about a teacher and brought the boy to the school administration office, said Oceanside police Lt. George Darrah.

"During a health and safety check, the 17-year-old student was found to have an empty handgun holster inside his pants," Darrah said. "The student was also found in possession of a journal where he wrote about killing other people during a school shooting at El Camino High School."

The boy was formerly a student at El Camino, Darrah said.

After the boy was taken into custody, detectives and school resource officers executed a search warrant at his home, where they found "more hand-written documentation threatening violence towards people at the school, replica guns and body armor" in his bedroom, Darrah said.