The school in question was identified as Animo Mae Jemison Charter Middle School, located in southern Los Angeles.
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.
The 13-year-old's alleged threats came to light when other students overheard him talking about gunning down his schoolmates, according to police. In a previous tweet, Sheriff Tim Murakami referred to the capture of a "ghost gun", but Villanueva clarified that the weapon in the threat case has a serial number.
More details are expected to be released about the arrest at a news conference set for 11:30 a.m., the department said.
The arrest comes a week after police and witnesses said a 16-year-old boy opened fire on his classmates at Saugus High School, spreading panic throughout the Santa Clarita campus and surrounding neighborhoods.
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The boy was arrested without incident at his home on suspicion of making criminal threats, the sheriff said. Police also took a relative of the accused student into custody.
Villanueva praised school officials for quickly alerting authorities and said the fact that people shared what they heard with law enforcement had prevented a tragedy. Bob Boese said. The man, who was not recognized, was held on $35,000 bail, he said.
The sheriff said the boy acknowledged posting threats along with pictures of a teen with a gun. No weapon was obtained in the case.
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.
An AR-15 rifle, ammunition and a list of intended targets were seized as part of the investigation into the school shooting threat, NBC LA reported.