--- category: Terrorism created: 2026-05-21 date: 2026-05-18 location: San Diego, California summary: On May 18, 2026, Cain Clark and Caleb Vazquez attacked the Islamic Center of San Diego, killing three people and leaving an accelerationist manifesto citing Atomwaffen Division, Terrorgram, and The Base; both perpetrators died at the scene. tags: - Event - MassShootingUSA - AntiMuslim - NeoNazi - Accelerationism - SiegeCulture - AtomwaffenDivision - Terrorgram - TheBase - SanDiego - California - 2020s updated: 2026-05-21 --- On May 18, 2026, [Cain Lee Clark](/people/cain-clark/) (17) and [Caleb Liam Vazquez](/people/caleb-vazquez/) (18) attacked the Islamic Center of San Diego (ICSD), the largest mosque in San Diego, located on Eckstrom Avenue in the Clairemont neighborhood. Three people were killed and one was wounded. Both perpetrators died at the scene - Clark shot Vazquez and then himself in their getaway vehicle approximately three-tenths of a mile from the mosque. The two had left a 75-page manifesto titled "The New Crusade: Sons of Tarrant" drawn explicitly from [siege](/concepts/siege-culture/) accelerationist ideology and citing [Atomwaffen Division](/organizations/atomwaffen-division/), [Terrorgram](/organizations/terrorgram-collective/), and [The Base](/organizations/the-base/) as organizations they were acting in support of. ### Timeline At approximately 9:42 a.m., Clark's mother contacted San Diego police to report her son missing and raise concerns that he was suicidal. At approximately 11:43 a.m., police received active shooter calls at the ICSD. Officers arrived within four minutes. Three victims were shot outside the mosque in the initial attack; security guard Amin Abdullah engaged the shooters in a sustained gun battle, delaying their entry into the building and allowing staff and approximately 150 students in the attached school to shelter in place. The shooters fled after Abdullah's resistance. During their escape, they carried out a drive-by shooting that struck a landscaper with a bullet deflected by his helmet, causing no serious injury. At approximately 12:43 p.m. police confirmed the scene was contained. By 1:07 p.m. the threat was neutralized. Both suspects were found dead in a white BMW three-tenths of a mile from the ICSD. According to subsequent investigation, [Caleb Vazquez](/people/caleb-vazquez/) had encouraged [Cain Clark](/people/cain-clark/) to shoot him; Clark shot Vazquez twice in the head inside the car and then killed himself.[^1] ### Victims Three people were killed at the scene. Two victims were named in reporting as Mansour Kaziha and Nader Awad; a third victim was not immediately identified publicly. No children in the attached school were harmed.[^2] ### The Manifesto: "The New Crusade: Sons of Tarrant" The 75-page manifesto took its title from [Brenton Tarrant](/people/brenton-tarrant/), the 2019 Christchurch shooter, framing the San Diego attack as a continuation of Tarrant's "momentum." It was explicitly accelerationist, arguing for indiscriminate violence to accelerate the collapse of liberal democratic society. The text explicitly named [Atomwaffen Division](/organizations/atomwaffen-division/), [Terrorgram](/organizations/terrorgram-collective/), and [The Base](/organizations/the-base/) as organizations the attack was carried out for. It cited [James Mason](/people/james-mason/)'s *Siege* and William Luther Pierce's *The Turner Diaries* as works that "should be read almost biblically by all soldiers of the white race." It praised Robert Bowers (the 2018 Tree of Life synagogue shooter) alongside Tarrant as models. Ideological content included explicit [Great Replacement Theory](/concepts/great-replacement-theory/), describing Muslims as "invaders" and "existential threats"; pervasive antisemitism, framing Jews as "the universal enemy"; expressed incel ideology from both authors; and explicit rejection of mainstream conservatism, including anti-Trump positions consistent with the accelerationist critique of electoral politics. [Cain Clark](/people/cain-clark/) described himself in his section as a "Christian ecofascist." [Caleb Vazquez](/people/caleb-vazquez/) praised Adolf Hitler as "the greatest man to ever walk this Earth." Physical evidence recovered from the scene included an SS logo on a fuel container found in the suspects' vehicle, a Sonnenrad patch and Atomwaffen Division logo on one shooter's tactical vest, and hate speech scrawled on one of the weapons.[^3][^4] ### Prior Warning Signs In 2025, the Chula Vista Police Department received a tip from an acquaintance of Vazquez expressing concern about his interest in "extremist ideology and mass-casualty attacks." Officers reviewed his social media, which was described in police reporting as "littered with neo-Nazi rhetoric," but determined the situation did not meet the legal threshold for arrest. No charges were filed at that time. Clark's social media was described by investigators as reflecting "possible associations with nihilistic violent extremist ideology." No prior law enforcement contact with Clark was reported. The two perpetrators met online before meeting in person, having found each other through online spaces associated with accelerationist ideology.[^5] ### Law Enforcement and Political Response The FBI opened a federal hate crime investigation. San Diego Police Chief Scott Wahl praised security guard Amin Abdullah as "pivotal" in preventing additional casualties. President Donald Trump issued a statement condemning the attack. No co-conspirators or third-party accomplices were identified; both perpetrators were deceased, precluding criminal prosecution. Trump adviser Laura Loomer drew significant criticism for social media posts following the attack that falsely characterized the victims and called for immigration enforcement actions targeting the ICSD and American Muslims. CAIR issued a statement calling the attack a product of rising anti-Muslim rhetoric in the political environment.[^6] ### Ideological Lineage The attack's documented ideological genealogy connects it directly to the research subject of this vault. The manifesto's citations trace to the [Siege Culture](/concepts/siege-culture/) lineage: [James Mason](/people/james-mason/)'s *Siege* (1992, compiled), popularized by [Iron March](/organizations/iron-march/) beginning in 2015 and adopted as foundational text by [Atomwaffen Division](/organizations/atomwaffen-division/) (founded on Iron March, October 2015). Terrorgram, cited in the manifesto as a recipient of the attack's dedication, distributed [Martinet Press](/organizations/martinet-press/) and [Tempel ov Blood](/organizations/tempel-ov-blood/) material through its channels. The manifesto's aesthetic - Sonnenrad imagery, AWD logo, Saints-culture format - reflects the visual grammar developed by Terrorgram and its predecessor networks. No confirmed connection to the [764](/organizations/764-network/) network or [Order of Nine Angles](/organizations/order-of-nine-angles/) was established in reporting through May 21, 2026. [^1]: NBC 7 San Diego. "Three killed, two suspects dead." May 18, 2026. https://www.nbcsandiego.com/news/local/san-diego-police-responding-to-reports-of-an-active-shooter-at-the-islamic-center-of-san-diego/4025204/ [^2]: Al Jazeera. "Mansour Kaziha, Nader Awad identified as victims in San Diego mosque attack." May 19, 2026. https://www.aljazeera.com/news/2026/5/19/mansour-kaziha-nader-awad-identified-as-victims-in-san-diego-mosque-attack [^3]: ADL. "San Diego Mosque Shooters' Apparent Manifestos Reveal Anti-Muslim Extremism." May 2026. https://www.adl.org/resources/article/san-diego-mosque-shooters-apparent-manifestos-reveal-anti-muslim-extremism [^4]: i24NEWS. "San Diego mosque shooters left 75-page neo-Nazi manifesto." https://www.i24news.tv/en/news/international/americas/artc-san-diego-mosque-shooters-left-75-page-neo-nazi-manifesto-blaming-jews-for-world-s-problems [^5]: 10News. "Chula Vista police had prior contact with one suspect from Monday's shooting at Islamic Center of San Diego." May 2026. https://www.10news.com/news/local-news/south-bay-news/chula-vista-police-had-prior-contact-with-one-suspect-from-mondays-shooting-at-islamic-center-of-san-diego [^6]: Fox 5 San Diego. "Trump responds to San Diego mosque attack." May 2026. https://fox5sandiego.com/news/local-news/trump-responds-san-diego-mosque-attack/