A gunman opened fire from the Pyramid of the Moon at Teotihuacán on April 20, killing a Canadian tourist and wounding 13 others before taking his own life.
The attack unfolded just before midday as visitors explored the ancient site north of Mexico City. Witnesses reported hearing shots from the pyramid’s upper tiers, prompting tourists to scramble down steep steps or seek shelter behind stone structures. Cellphone images circulated online showed a man in a checked shirt brandishing a pistol near the summit while others fled in panic.
Authorities recovered a gun, bullets, and a knife at the scene. The shooter was wearing tactical boots and pants, according to Mexican media citing police sources. Seven people suffered gunshot wounds; the others were injured in falls during the chaotic evacuation.
The injured included six U.S. Citizens, three Colombians, one Russian, one Brazilian, one Dutch national, and two Canadians — one of whom died. The youngest victim was a 6-year-old boy from Colombia; the oldest was a 61-year-old woman from the United States. All were treated in area hospitals.
Officials identified the assailant as 27-year-old Julio César Jasso Ramírez, a native of Guerrero who had been staying in a hotel near the site. He had carefully scouted the pyramids beforehand and carried a tactical-style backpack containing an analog cellphone, bus tickets, books, and handwritten notes referencing U.S. Mass shootings from April 1999.
Among the materials was an AI-modified photo showing him alongside the perpetrators of the Columbine High School massacre. The attack occurred on the 27th anniversary of that shooting, which also fell on Adolf Hitler’s birthday — a coincidence noted by Mexican media but not confirmed as intentional by authorities.
Mexican officials said the attack was not spontaneous and appeared planned. They found no link to cartel violence but acknowledged the shooter expressed admiration for Hitler and the Columbine attackers. President Claudia Sheinbaum lamented the violence, calling it a painful moment for the nation and urging analysis of “external influences” that may provoke such acts.
The timing heightened concerns as Mexico prepares to co-host the 2026 FIFA World Cup. Security Secretary Omar García Harfuch announced increased patrols and digital surveillance at major tourist destinations to prevent future threats.
In Ottawa, Prime Minister Mark Carney offered condolences to the family of the deceased Canadian and praised Mexico’s response, calling the incident a “terrible circumstance.” The injured Canadian has been identified as 29-year-old Delicia Li de Yong.
How the attack unfolded at Teotihuacán
Shots rang out from the Pyramid of the Moon just before noon, triggering immediate panic among visitors. Tourists described hearing gunfire and seeing smoke as they fled downward or took cover behind ancient stone walls. Some jumped from mid-level platforms to escape, resulting in fall-related injuries.
Security personnel and National Guard members stationed at the perimeter responded quickly, establishing a perimeter and assisting the wounded. Emergency vehicles arrived within minutes, transporting victims to nearby hospitals in Mexico State.
The site, a UNESCO World Heritage landmark that drew over 1.8 million visitors last year, was evacuated and closed for investigation. Forensic teams combed the area for evidence, including shell casings and digital traces from the shooter’s devices.
What investigators found in the shooter’s belongings
Inside the tactical backpack, authorities discovered books and handwritten notes referencing violent incidents in the United States during April 1999. Though officials avoided naming Columbine directly, the references were unmistakable to those familiar with the date and context.
The AI-altered photograph — depicting the shooter posed with Eric Harris and Dylan Klebold — was described by an anonymous state official as troubling evidence of ideological identification. Such imagery has appeared in prior cases linked to online true crime communities that glorify past mass shootings.
No extremist group affiliations were immediately established, but the materials pointed to a fixation on infamy rather than political or criminal motive. The shooter had no known criminal record prior to the attack.
Why the timing raises questions
The attack occurred on April 20 — a date loaded with symbolic weight in extremist circles due to its association with Hitler’s birth and the Columbine anniversary. While authorities stopped short of calling it deliberate, the convergence of these anniversaries cannot be ignored.
Previous attacks in the region have shown similar patterns: a 2023 school shooting in Santa Fe, Argentina, was linked to a teenager involved in the same online subculture that emerged after Columbine. These communities often treat mass violence as a form of notoriety-seeking performance.
Mexican officials acknowledged the need to study how foreign ideologies infiltrate vulnerable individuals, even in the absence of direct organizational ties. The shooter’s apparent isolation and pre-attack reconnaissance suggest a lone actor shaped by digital consumption.
What In other words for Mexico’s security outlook
The incident challenges Mexico’s narrative of readiness for the 2026 World Cup, despite repeated assurances from officials about comprehensive security plans. While large-scale cartel violence remains the dominant security concern, this attack reveals a different kind of threat: ideologically motivated, lone-wolf violence with transnational inspiration.
Heightened patrols and cyber monitoring may deter opportunistic crimes but are less effective against actors who plan in silence and abandon minimal digital footprints — as evidenced by the analog cellphone. Balancing openness at heritage sites with public safety will require nuanced adjustments.
For now, the focus remains on victim support and forensic clarity. The deceased Canadian woman has not been publicly named, pending family notification. Investigations continue into the shooter’s movements, contacts, and potential online footprint.
Was the attack linked to organized crime or cartels?
No. Mexican authorities have explicitly stated there is no evidence connecting the shooter to cartel activity. The investigation points instead to personal motives rooted in fascination with past mass shootings in the United States.
Why did the shooter choose Teotihuacán?
Officials say he scouted the site in advance, suggesting familiarity with its layout and visitor patterns. Its status as a major international tourist destination likely offered high visibility — a factor that may have appealed to someone seeking notoriety.
Is there a broader trend of Columbine-inspired violence in Latin America?
While rare, You’ll see precedents. Earlier in April 2025, Argentine authorities tied a school shooting in Santa Fe to the “true crime community” that glorifies Columbine. Such cases remain isolated but underscore how online subcultures can transcend borders.
