Gunman Opens Fire at Mexico's Teotihuacan Pyramids, Killing Canadian Tourist and Injuring 13 Others

A gunman opened fire on tourists at Mexico's ancient Teotihuacan archaeological site on April 20, killing at least one Canadian woman and injuring 13 other visitors before dying after being confronted by security forces, in an attack authorities say was deliberately timed to coincide with the 27th anniversary of the Columbine High School massacre.

The attack occurred at approximately 11:20 a.m. local time at Teotihuacan, a UNESCO World Heritage Site located about 30 miles northeast of Mexico City and home to the Pyramid of the Sun and Pyramid of the Moon. The site draws millions of tourists each year and is one of Mexico's most visited destinations.

The suspect, identified by state authorities as Julio César Jasso Ramírez, 27, a Mexico City resident, climbed atop the Pyramid of the Moon, ordered bystanders to lie on the ground, then relocated to another position and continued firing — discharging approximately 20 to 30 shots in total. Security forces arrived within ten minutes. After a confrontation with officers, Jasso Ramírez was wounded and then killed himself.

The sole fatality was a 29-year-old Canadian woman whose name has not been publicly released. Among the 13 injured were six Americans, three Colombians, two Brazilians, one Russian citizen, and one additional Canadian. Several of the wounded received treatment at area hospitals, with the most serious cases transferred to facilities in Mexico City.

The State of Mexico Prosecutor's Office said the attacker carried a backpack containing books and materials specifically related to "violent incidents known to have occurred in the United States in April 1999" — an apparent reference to the Columbine High School shooting of April 20, 1999. Reports also indicated the suspect had expressed admiration for Adolf Hitler and had created an AI-generated image of himself depicted alongside the Columbine shooters. The attack occurred on April 20 — simultaneously the anniversary of Columbine and Adolf Hitler's birthday, a date historically associated with extremist violence in the United States and abroad.

Mexican President Claudia Sheinbaum addressed the nation shortly after the attack, expressing sorrow and solidarity with the victims. "What happened today in Teotihuacán deeply hurts us," Sheinbaum said. "I express my most sincere solidarity with the people affected and their families. We are in contact with the Canadian Embassy." She called for a comprehensive review of security protocols at open-air archaeological sites across Mexico.

The Canadian Embassy in Mexico City issued a statement confirming it was providing consular assistance to the affected Canadian nationals and expressed condolences to the victim's family. The U.S. Embassy confirmed it was aware of the incident and was in contact with affected American citizens.

The timing of the attack proved particularly alarming given Mexico's global profile in the coming months. Mexico is co-hosting the 2026 FIFA World Cup alongside the United States and Canada, with matches scheduled at stadiums across the country beginning in June. Tourism authorities and security officials were expected to convene emergency meetings to review protocols at major attractions, according to officials briefed on the matter.

Security experts noted the profound challenge of protecting open-air archaeological sites, which by their nature cover enormous areas and cannot be secured with the same layered screening protocols used at airports or enclosed venues. Teotihuacan spans approximately eight square miles, with the Avenue of the Dead connecting dozens of temples, plazas, and pyramids that receive thousands of daily visitors.

The Mexican government faced immediate calls to bolster security presence at heritage sites and tourist destinations in advance of the World Cup. Critics pointed out that while cartel violence has declined in some parts of the country, isolated attacks on tourist areas — rare but devastating when they occur — expose a security gap that requires urgent attention.

Security analysts who study ideologically motivated violence noted that the suspect's apparent identification with the Columbine perpetrators points to an international spread of a dangerous online subculture that glorifies the 1999 attack. Law enforcement agencies in multiple countries have issued warnings in recent years about Columbine anniversary threats. An investigation into the attacker's background, online activity, and potential accomplices remains underway, according to the Prosecutor's Office.