REDWOOD CITY, Calif. -- Thanks to a single voice speaking up, a possible school shooting was prevented.

Police in Menlo-Atherton received a tip from its "Say Something" tip line on Sept. 10 that indicated a former student at an area high school had posted concerning content to Instagram referencing the high school.

Police locked down the Menlo-Atherton High School campus in addition to a nearby middle school for an hour until the student was located and weapons were recovered from the home. The investigation is ongoing, police say.

A mother is making it her life's mission to prevent tragedy. Nicole Hockley's son Dylan was one of 20 children killed in 2012 at the Sandy Hook Elementary School shooting . Hockley co-founded the nonprofit Sandy Hook Promise.

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