In a horrifying incident that has sent shockwaves through San Diego and beyond, a 17-year-old suspect, identified as Cain Clark, was captured on home CCTV stealing three firearms from his own mother before joining an 18-year-old accomplice in a deadly attack at the Islamic Center of San Diego, the largest mosque in the county.

The shooting unfolded on Monday, May 18, 2026, just before noon at the Islamic Center in the Clairemont neighborhood. The two teenagers opened fire outside the mosque, killing three adult men — including a heroic security guard who authorities credit with preventing a far deadlier massacre inside where children were attending school. All children and other worshippers were safely evacuated.

Surveillance footage from the suspect’s home reportedly shows the 17-year-old methodically taking his mother’s guns and leaving the house. Hours earlier, at around 9:42 a.m., the boy’s mother had frantically called police. She reported her son missing, along with her vehicle and several firearms. She described him as suicidal and said he was likely with a friend, both dressed in camouflage clothing.

Police were already speaking with the mother when the active shooter calls came in from the mosque. What truly stunned investigators, according to sources close to the case, was a statement the mother made at the scene or during initial questioning — a raw, emotional outburst that highlighted the unimaginable horror of realizing her own child was involved in such violence. Her words reportedly underscored a mother’s worst nightmare: knowing she had tried to warn authorities, yet tragedy still unfolded.

The two suspects, Cain Clark (17) and Caleb Vasquez (18), were later found dead in the stolen vehicle a short distance away, apparently from self-inflicted gunshot wounds. The attack is being investigated as a potential hate crime, with hate-related rhetoric reportedly found on weapons and other evidence.

The security guard, praised for his quick actions, is believed to have confronted the gunmen outside, stopping them from entering the building where dozens of children were present. Three men died at the scene, but officials say the death toll could have been much higher without his bravery.

Community leaders, including the mosque’s imam, expressed heartbreak over the targeting of a place of worship during a sacred time. The Islamic Center serves not only as a mosque but also as a community hub and school. Vigils and support funds have already begun for the victims’ families.

This tragedy raises urgent questions about youth mental health, access to firearms in the home, and rising tensions targeting religious communities. As the FBI joins the investigation, San Diego residents are left grappling with how a quiet suburban home and routine morning turned into one of the city’s most shocking acts of violence in recent memory.

The mother’s desperate early warning and her devastating realization at the scene remain among the most haunting details — a painful reminder that sometimes the warning signs are there, yet evil still finds a way.