Mira Costa High School in Manhattan Beach is on lockdown after receiving the third threat this month.
Parents were alerted this afternoon via email about the threat, according to City News Service. Principal Ben Dale wrote in the email, "We have received another threat this morning that we are investigating. MBPD is here with us conducting a search. Students are in a shelter in place, meaning they will be in classrooms, safe with their teachers, until we have concluded our search." Students were eventually allowed a controlled lunch while police continued to search the rest of the campus, ABC 7 reports.
Classes were first cancelled on December 7, when someone left a bomb threat using a device that disguised their voice to a general voicemail box in the school's administrative office, according to the Daily Breeze. On December 11, another threat was emailed to the school. Manhattan Beach Unified School District Superintendent Mike Matthews described that threat as "very specific," but it's unclear what that threat entailed.
In both cases, searches of the campus turned up nothing. Matthews indicated in a letter to parents that the FBI was working with MBPD on tracing the origin of the threats, and that two parents had called in tips.
Mira Costa High School was shut down for two days in 2014 after someone used the anonymous messaging app Yik Yak to make a series of threats.
