Mexican authorities have confirmed that Monday's deadly shooting at one of Mexico's most visited archaeological sites was a calculated, premeditated attack—not a random act of violence.
A gunman identified as 27-year-old Julio César Jasso opened fire at the Teotihuacán pyramids, located about 50 kilometres northeast of Mexico City, killing a Canadian woman and injuring 13 others, including another Canadian national. The gunman died from a self-inflicted gunshot wound after the rampage.
Mexican officials say evidence suggests Jasso may have deliberately timed the attack to coincide with the 27th anniversary of the Columbine High School shooting. Both incidents occurred at approximately 11:30 a.m. local time.
Evidence of premeditation
José Luis Cervantes Martínez, attorney-general of the state of Mexico, revealed that investigators discovered a backpack containing books and materials related to the 1999 Columbine massacre. The gunman had been staying at a nearby hotel, suggesting the attack was planned in advance.
"This was not a spontaneous incident," Mexican officials stated. Jasso fired indiscriminately from atop one of the ancient pyramids while ranting about hating tourists and playing unusual music.
The wounded Canadian has been identified as 29-year-old Delicia Li de Yong. Twelve other victims, ranging in age from six to 61, were hospitalized and are reported to be in stable condition. Mexican authorities have not publicly identified the Canadian woman who was killed.
Tourism site sees thousands flee in panic
Witnesses described scenes of chaos as dozens of visitors jumped from the pyramid, scrambled for exits, and took shelter during the shooting. The Teotihuacán pyramids, a UNESCO World Heritage Site featuring massive stone structures built by three ancient civilizations, attracted more than 1.8 million visitors last year.
Canada offers condolences, Mexico promises investigation
Prime Minister Mark Carney extended condolences to the family of the deceased Canadian, while Foreign Affairs Minister Anita Anand confirmed she has been in contact with Mexican counterparts. Mexican President Claudia Sheinbaum has personally overseen the investigation and promised swift action.
"This tragedy underscores the urgent need to strengthen our security protocols," Sheinbaum said on Tuesday as Mexico beefed up security measures at multiple tourist destinations across the country.
World Cup security heightened
The incident comes as Mexico prepares to host 13 matches during the 2026 FIFA World Cup, scheduled to begin on June 11. Mexico's security secretary, Omar García Harfuch, announced plans for increased ground forces and digital cyber patrols at major tourist sites leading up to the tournament.
Mexican authorities have not linked Monday's attack to cartel violence, distinguishing it from recent security incidents in other parts of Mexico. In Puerto Vallarta, cartel-related violence forced thousands of tourists to shelter in their hotels just two months ago.
Columbine copycat phenomenon
The connection to Columbine reflects a documented pattern of copycat attacks inspired by the 1999 shooting. A 2019 Mother Jones investigation found that the Columbine massacre has inspired at least 100 plots or attacks, with at least 18 copycats specifically targeting the anniversary date.
This article is based on reporting from The Globe and Mail and official statements from Mexican authorities. Original reporting: The Globe and Mail