Parents of Caleb Vazquez, one of two teenagers involved in a deadly shooting at a San Diego mosque, are suing a mental health facility, alleging it ignored a warning from the FBI about their son's troubling online behavior days before the attack. According to court documents, the FBI contacted Vazquez's mother on May 14, informing her that her 18-year-old son had made concerning comments about school shootings on the dark web. Vazquez had been receiving treatment at Park Mental Health Treatment of San Diego for conditions such as depression and psychotic episodes. His mother claims the facility failed to act despite signs that her son posed a serious threat to himself and others. Following the FBI’s warning, Vazquez’s mother immediately informed the treatment center. She spoke with her son’s therapist and a program director on May 15, relaying the FBI’s concerns. However, on May 18—just hours before the mosque shooting—staff at the facility told her that Vazquez was missing. Surveillance footage showed him leaving the facility the night before. Vazquez and another teen, Cain Clark, 17, killed three people at the mosque before taking their own lives. It remains unclear whether Vazquez was permitted to leave or if he violated the facility’s rules by doing so. Park Mental Health Treatment offers various mental health services, including some with 24-hour surveillance, while others focus on more limited counseling. The center did not respond to a request for comment. In a prior statement to a local radio station, Park Mental Health denied responsibility for Vazquez’s actions, saying neither the facility nor its employees were accountable for what occurred. The FBI has also declined to comment, citing internal policy. Vazquez had previously been hospitalized for about three days in January 2026 after telling a classmate he wanted to carry out a school shooting. Nearly a year before that, he had been flagged by law enforcement for alarming behavior and admiration of Nazi ideology, leading to the seizure of 26 guns from his father under a California law that allows firearms to be removed from individuals deemed dangerous. Authorities have said Vazquez met Clark online and that both were influenced by extremist ideas. However, details about how they connected or which weapons were used in the shooting have not been disclosed. The lawsuit was filed on the same day that North Carolina authorities announced the indictment of a 17-year-old in connection with the attack.