The sheriff says the teen threatened to shoot classmates and staff on Friday at Animo Mae Jemison Charter Middle School in Willowbrook.
A 13-year-old student and an adult family member have been arrested in connection with a serious threat against a South Los Angeles middle school, and an AR-15 assault rifle and a list of targeted students have been seized, the Los Angeles County Sheriff's Department said Friday.
Murakami did not name the school involved in the threat but said there would be a press conference on the incident on Friday at 11:30 a.m.
Authorities say an arrest has been made after a student threatened to shoot other students and staff at a Los Angeles-area school.
"The fact that people stepped forward and said what they had heard led to us to being able to prevent a tragedy today". In the past week, police have arrested several teenagers on suspicion of threatening schools in the area and have investigated multiple reports of threats, some of which were found not to be credible.
This thwarted shooting comes one week after two students were shot and killed at Saugus High School, which is also in Los Angeles County.
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Additional details, including the targeted school, were not immediately released by authorities.
The 13-year-old was taken into custody without further incident, authorities said.
Police declined to name the boy or his 19-year-old relative, who is being held on $35,000 bail. The sheriff says the guns were destroyed after the father became a "prohibited possessor". No weapons were recovered in the case.
Police don't yet know where and when Berhow got the handgun or what his motive was for the shooting at Saugus High.
Villanueva said Thursday that Nathaniel Berhow's.45 caliber, 1911-model replica semi-automatic pistol was assembled from gun parts and did not have a serial number. On Friday morning, police increased patrols around Charter Oak High School in Covina after a threat to the school. In a previous tweet, Sheriff Tim Murakami referred to the capture of a "ghost weapon", but Villanueva clarified that the weapon in the case of threat has a serial number.