Mother of San Diego Mosque Shooter Sues Treatment Center, Alleges FBI Warning Was Ignored

Since the May 18, 2026 shooting at a San Diego mosque that killed three people, the story has moved from tragedy to a legal fight over who saw the warning signs and did nothing.

A lawsuit filed August 31 in San Diego court by the mother of shooter Caleb Vazquez alleges that Park Mental Health Treatment of San Diego failed to act despite direct notice that her 18-year-old son posed an imminent threat, according to the Associated Press, ABC News, and Arab News. Vazquez was living at the facility and being treated for depression and psychotic episodes at the time.

What the Lawsuit Says Happened

The FBI called Vazquez's mother on the evening of May 14, warning her that her son was making concerning comments about school shootings on the dark web, the lawsuit states. She says she immediately left a message for the treatment facility's staff. She followed up by telling her son's therapist on May 15, and told a program director that same night, according to the filing cited by AP.

On the morning of May 18, facility employees called the mother to say Vazquez was missing. Surveillance video later showed him leaving the property at 8 p.m. the night before, according to the lawsuit. His parents were driving around looking for him the morning of the shooting. Vazquez and a second teenager killed three people at the Islamic Center that day before both took their own lives.

Park Mental Health advertises a range of treatment options, some with 24-hour surveillance and some with more limited counseling, per AP's reporting.

The Facility's Defense

Park Mental Health has not backed down. In a statement previously given to radio station KPBS and repeated across the AP wire coverage picked up by WBAL, Bangor Daily News, 2news.com and Arab News, the facility said: "While it is understandable that his parents might seek to blame someone in their time of loss, this lawsuit is misguided in that neither Park nor its employees are responsible for Mr. Vazquez's actions. Only he and his coconspirator bear responsibility for their conduct and, ultimately, his death."

A residential treatment program is not a jail, and a facility that allows patients any autonomy cannot guarantee it will stop someone determined to leave. The FBI, for its part, declined to comment on the case Saturday, citing agency policy, according to AP.

A Longer Pattern of Warnings

The FBI's May 14 call was not the first red flag. Vazquez had been hospitalized for roughly three days in January 2026 after telling a classmate he wanted to carry out a school shooting, per the reporting distributed by AP and republished by ABC News and others.

About a year before that, he had been flagged to law enforcement for alarming behavior and for idolizing Nazis, prompting police to confiscate 26 guns from his father under a 2014 California law that allows firearms to be seized from people deemed dangerous. That history sits at the center of the lawsuit's argument that the facility had more than enough information to act.

No criminal charges have been filed against Park Mental Health or its staff. The lawsuit is a civil filing, and its allegations are unproven claims, not court findings.

A Parallel Debate in Britain

A separate but thematically connected story is unfolding in the UK, where the public inquiry into the June 2023 Nottingham stabbings that killed students Barnaby Webber and Grace O'Malley-Kumar, and caretaker Ian Coates, is nearing its close. Killer Valdo Calocane, diagnosed with paranoid schizophrenia, was sectioned four times in two years and repeatedly refused medication before the attack, the Guardian reported.

Mind chief executive Dr. Sarah Hughes told the Guardian that mental health charities have "failed to acknowledge" that a minority of people with severe mental illness can pose a violence risk, saying the sector avoided the topic for fear of worsening stigma. "We, as a charity sector, have failed to acknowledge that violence does happen in some circumstances," Hughes said. "Some do and the consequences are grave."

Stigma against people with mental illness has real, documented harms, including discrimination in housing and employment, and the overwhelming majority of people with mental illness never commit violence. Hughes' point is that the sector's effort to protect patients from stigma left almost no room to discuss the narrower, harder truth: some warning signs do predict danger, and systems built to avoid the conversation entirely can miss them.

Emma Webber, Barnaby's mother, told the Guardian she welcomed Hughes' remarks, saying she felt the danger Calocane posed had been "almost deliberately quietened."

Neither case has been resolved. The Nottingham inquiry is expected to issue findings after its closure; no timeline has been given in current reporting. The San Diego lawsuit has not yet been answered in court by Park Mental Health beyond its public statement, and no trial date has been set.