Overview

• A student reported Instagram posts that showed firearms, ammunition and a mapped plan for an attack to the Say Something anonymous line.
• Police placed Menlo-Atherton High School and a nearby middle school on lockdown for about an hour as they located a suspect.
• Law enforcement detained an alleged former student and later recovered weapons from the individual's home, authorities and the nonprofit said.
• The Sequoia Union High School District confirmed Menlo-Atherton as the campus involved and thanked the anonymous tipster for prompting swift action.
• Police say the investigation remains ongoing, and Sandy Hook Promise highlights the case as evidence that a single report can trigger lifesaving intervention.