Teotihuacán Gunman Julio César Jasso Ramírez Carried Columbine Massacre Material, Officials Confirm

Julio César Jasso Ramírez, 27, who opened fire from the Pyramid of the Moon at Teotihuacán, was found with a handgun, ammunition, a knife, and documents referencing violent acts, according to Mexican officials. President Claudia Sheinbaum stated on Tuesday that Jasso Ramírez displayed signs of psychological distress and appeared influenced by overseas incidents.

José Luis Cervantes Martínez, attorney general for the State of Mexico, confirmed that among Jasso Ramírez's belongings were "literature, images and documents allegedly related to acts of violence that... may have occurred in the United States in April 1999," specifically mentioning the Columbine High School massacre.

Authorities described the attack as premeditated, noting that Jasso Ramírez had repeatedly visited the UNESCO World Heritage site. He arrived on Monday just before noon, ascended the ancient pyramid, and began shooting. A 32-year-old Canadian tourist was killed, and 13 individuals, including minors from Colombia and Brazil, sustained injuries, with seven wounded by gunshots.

National Guard and municipal police officers cornered Jasso Ramírez on the pyramid. He fired 14 times at victims and officers before a national guardsman shot him in the leg, at which point he took his own life. The Teotihuacán archaeological site, which attracted 1.8 million visitors last year, was closed following the incident but is set to reopen with reinforced security, including metal detectors at entrances, under a nationwide directive from President Sheinbaum.