On May 18, 2026, two teenagers turned a peaceful afternoon at San Diego’s largest mosque into tragedy. While the bravery of the victims who stopped a worse massacre deserves every honor, understanding what drove the attackers is critical if we want to prevent the next one.
The shooters were quickly identified as Cain Lee Clark, 17, and Caleb Liam Vazquez, 18. They died by suicide in their vehicle just blocks from the Islamic Center of San Diego after killing three men.
How Two Strangers Connected Online and Plotted Violence
Authorities say the pair met online, discovered they both lived in the San Diego area, and bonded over shared extremist views. They “exchanged radicalized ideology” in digital spaces where hate festers unchecked.
Hours before the attack, Clark’s mother called police. Her son was missing, suicidal, and had taken her vehicle along with several guns. Police were already searching when the first 911 calls came in from the mosque around 11:40 a.m.
The teens arrived wearing camouflage, armed, and ready. They engaged the security guard immediately, continued into the building, then shot two more men in the parking lot before fleeing and turning the guns on themselves.
The Manifesto: 75 Pages of Broad, Unfiltered Hate
A document circulating online — reportedly a joint 75-page manifesto from the pair — has been reviewed by investigators and extremism experts. It’s filled with:
- Neo-Nazi symbols and slurs
- Praise for the Christchurch mosque shooter Brenton Tarrant
- Accelerationist ideology (using violence to hasten societal collapse and a white ethnostate)
- Antisemitism, anti-Islam views, anti-LGBTQ rhetoric, extreme misogyny, and racist attacks on multiple groups
- Hostility toward a wide range of races, religions, and even some political figures (including anti-Trump/MAGA sentiments in places)
FBI Special Agent in Charge Mark Remily emphasized: “They didn’t discriminate on who they hated. It covered a wide aspect of races and religions, more than just the Islamic people.”
Writings recovered from the SUV echoed these themes, describing their vision for the world through the lens of racial and religious hatred. A gas can at the scene reportedly bore Nazi SS lightning-bolt symbols.
This wasn’t a narrowly targeted anti-Muslim plot in the classic sense — it was nihilistic, scattershot extremism that saw enemies everywhere. Yet they chose a mosque with a school full of children inside.
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Weapons, Planning, and Red Flags
Searches of three associated homes turned up more than 30 guns, a crossbow, ammunition, tactical gear, and electronics. The firearms used in the attack were not registered to the teens, and investigators are tracing how they obtained them.
One shooter had connections to an online virtual school program. Video allegedly shows them livestreaming parts of the attack. Patches on tactical gear reportedly included neo-Nazi and accelerationist imagery.
Parents and communities are left wondering what signs they missed. Clark’s mother acted quickly once she realized something was wrong — but it was already too late.