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

Florida woman charged with murder evading police after body found in shallow grave, sheriff says

Florida Woman Charged With Murder After Body Found in Shallow Grave, Sheriff Says

Authorities in Florida are searching for a woman charged with murder after…
Body found Chicago news: Family fears body found in garbage can at 54th and Union is missing person Zenobia Weatherspoon

Family Fears Body Found in Chicago Garbage Can Near 54th and Union Is Missing Zenobia Weatherspoon

CHICAGO () — Chicago police have opened an investigation after a woman…
California grad student snared in alleged bomb plot after leaving terrifying message in restroom

California Graduate Student Arrested in Alleged Bomb Plot After Alarming Restroom Message

A graduate student accused of trying to spread fear and hateful rhetoric…
'Explosive diarrhea' parasite invades Long Island as separate bacteria outbreak sickens dozens after music festival

Diarrhea-Causing Parasite Spreads on Long Island as Separate Festival Bacteria Outbreak Sickens Dozens

A parasite widely known for causing severe, prolonged diarrhea has sickened 17…
Texas teens arrested after swimmer Daniel Erving drowns

Texas Teens Arrested in Connection With Swimmer Daniel Erving’s Drowning

Two teenagers have been arrested in connection with the drowning of a…
Nancy Guthrie search scene drew YouTubers, arrests and bizarre roadside claims, docs say

Nancy Guthrie Search Scene Spiraled Into YouTuber Chaos, Arrests and Bizarre Roadside Claims, Court Docs Reveal

A true-crime YouTuber is accused of transforming a street near the Nancy…
Hegseth announces joint task force with DOJ to prosecute leaks to journalists 'with the full force of the law'

Pete Hegseth Unveils DOJ Task Force to Crack Down on Leaks to Journalists

Pentagon chief Pete Hegseth announced Monday that the Defense Department is forming…
Migrant who fled Ireland after American mother's murder is arrested in Jordan

Suspect in American Mother’s Murder in Ireland Arrested in Jordan After Fleeing Country

A man who left Ireland after the violent killing of an American…
Judge rebukes Trump and DOJ over IRS lawsuit, refers lawyer for disciplinary proceedings

Judge Rebukes Trump and DOJ in IRS Lawsuit, Refers Lawyer for Disciplinary Review

Washington — A federal judge on Monday sanctioned attorneys representing President Trump…
12-year-old visitor injured by bison at Yellowstone National Park

12-Year-Old Visitor Injured in Bison Encounter at Yellowstone National Park

A 12-year-old visitor was injured by a bison Friday morning at Yellowstone…
Trump asks Supreme Court to uphold birthright citizenship order

Two Supreme Court Justices Head to Congress Tuesday: What’s Behind the Rare Testimony

The Supreme Court is seeking $228 million for the coming year, with…
Bangkok, Thailand bar fire kills dozens, more seriously injured; some found trapped in windowless bathrooms

Dozens Killed in Bangkok Bar Fire as Victims Found Trapped in Windowless Bathrooms

BANGKOK — Authorities said Monday that many of the victims of a…