Possible school shooting attack stopped at Northern California high school via Sandy Hook Promise tip line

A single voice made a difference in preventing a possible school attack, according to an organization formed in response to the tragic events at Sandy Hook Elementary School.

On September 10, Sandy Hook Promise, a nonprofit, informed the Atherton, California police about a tip regarding a former student who had shared alarming Instagram posts related to a local high school.

The police took immediate action, temporarily securing Menlo-Atherton High School and a nearby middle school for an hour until they could locate the student. The investigation is currently ongoing.

Nicole Hockley, whose son Dylan was among the 20 children lost during the 2012 Sandy Hook tragedy, has dedicated herself to preventing similar incidents. She co-founded Sandy Hook Promise.

A free resource that teaches students how to recognize warning signs of violence and offers an anonymous reporting system.

“Each time we prevent an act of violence or a school shooting, it means another community is spared from the trauma I experienced,” Hockley expressed.

On Monday, Sandy Hook Promise announced their involvement in thwarting a possible attack on a school within the Sequoia Union High School District in Redwood City, California.

MORE: How many lives have been lost in school shootings in the US this year?

“What we know is that a student saw a concerning post on a friend’s Instagram feed and reported it to our anonymous reporting system manned at our crisis center down in Miami,” Hockley said.

According to Atherton Police Department, the posts included images of ammunition. Sandy Hook Promise also claims the posts included an image of the school.

Law enforcement later detained the student.

The organization said the Menlo-Atherton incident is the 19th “credible planned” school attack nationwide” the system has prevented since its launch in 2018. About 5,000 school districts partner with the organization and tips are accepted via a mobile app, text, phone, or through a website.

“It is an example of one voice making a significant difference to a community and we really applaud that student for raising the alarm bells saying this is really concerning I think this person is planning to do something they need help,” Hockley said.

The district’s superintendent released the following statement:

“Nothing is more important to us than keeping our students and staff safe. In the wake of violence at other schools around the country, we take our responsibility to put prevention measures in place extremely seriously. Sandy Hook Promise has been a vital partner in helping our students and staff recognize warning signs of potential violence. We are grateful that Sandy Hook’s Say Something Anonymous Reporting system made swift action by local law enforcement and school administrators possible when a member of our community reported a potential threat against one of our schools recently. As a result of this program, we were able to keep students and staff safe.”

MORE: US colleges experiencing epidemic of swatting calls after shooting of Charlie Kirk

Since its launch in 2018, the organization’s anonymous reporting system has stopped at least 19 credible planned school attacks nationwide.

“At a time when so many of us feel powerless of the epidemic of gun violence, or the epidemic of youth violence, this is proof that prevention works,” Hockley said.

KGO asked Hockley what fuels her work.

“This is what keeps me going, the love that I have for my surviving child and child that died – Dylan – but also knowing that we can create a safer future,” Hockley said.

The incident took place on the same day as a mass shooting in Evergreen, Colorado, where a 16-year-old shooter shot two students and then himself. The two students were in critical condition afterward. The school reopened this week for classes.

Hockley said they receive at least 200 tips a day from kids across the country.

School districts can partner with Sandy Hook Promise for free. Hockley encourages schools to visit their website.

Editorial Note: The Atherton Police Department clarified details ABC7 News in San Francisco received from Sandy Hook Promise about the potential threat. They say weapons were not recovered, and the social media posts contained an image of ammunition but no firearms were depicted.

ABC News contributed to this report.

Copyright © 2025 WPVI-TV. All Rights Reserved.

You May Also Like

Bystanders and police officers work together to lift a Volkswagen Beetle off an e-bike rider

Video Shows Bystanders, Police Lifting Volkswagen Off Woman Pinned in E-Bike Crash

A dramatic rescue unfolded on a busy Pennsylvania roadway after an e-bike…
First responders honor World Trade Center beam arriving at Boston fallen heroes memorial

First Responders Honor World Trade Center Beam at Boston Fallen Heroes Memorial

Tunnel to Towers’ Steel Across America tour made a solemn stop in…
MTA worker, mom of 3, fatally struck by oncoming train while working on NYC subway tracks

MTA Worker and Mom of 3 Fatally Struck on NYC Subway Tracks

An MTA employee and mother of three was killed late Thursday night…
In this June 18, 1999 file photo, Steve Irwin,

Steve Irwin’s Children Share Heartfelt Tributes 20 Years On

Steve Irwin, the beloved Australian wildlife expert known worldwide as “The Crocodile…
Officials identify victims killed, officers injured in Minneapolis apartment shooting

Victims, Injured Officers Identified in Minneapolis Apartment Shooting

Minnesota authorities have identified the people killed and injured in Wednesday’s shooting…
Smuggler who brought migrants through tunnel under U.S.-Mexico border pleads guilty

Smuggler Pleads Guilty to Bringing Migrants Through Tunnel Beneath U.S.-Mexico Border

More than 18 months after authorities uncovered an underground tunnel beneath the…
Georgia cop Trenton Garner reveals why he killed baby donkey HeeHaw

Why Georgia Cop Trenton Garner Killed Baby Donkey HeeHaw

A Georgia police officer who fatally shot HeeHaw, a young donkey cherished…
Missouri Supreme Court blocks GOP-friendly US House map from midterm elections

Missouri High Court Blocks GOP House Map Before Midterms

Missouri’s Republican-backed congressional map suffered a significant setback Thursday, as the state…
Teen mom killed in double homicide had protection orders against ex-boyfriend charged in shooting

Teen Mom Killed in Double Homicide Had Protection Orders Against Ex-Boyfriend Charged in Shooting

A 19-year-old mother who was allegedly killed by her ex-boyfriend in a…
Lindsay Clancy’s wheelchair has a curious sticker – what it could mean

What the Sticker on Lindsay Clancy’s Wheelchair May Mean

A small detail on Lindsay Clancy’s wheelchair drew unexpected attention this week,…
Trump names Adam Telle acting secretary of the Army following Dan Driscoll's resignation

Trump Appoints Adam Telle Acting Army Secretary After Dan Driscoll Resigns

Army Secretary Dan Driscoll submits resignation after clashing with Hegseth for ‘months’…
Florida woman, 70, opens fire inside Port Orange police department lobby, chief says

70-Year-Old Florida Woman Opens Fire Inside Port Orange Police Department Lobby, Chief Says

A 70-year-old Florida woman was confronted by officers Thursday morning after authorities…