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Gunman in deadly Mexican tourist site shooting was influenced by violent acts in US: Officials

2:13
Americans injured in deadly shooting at Mexico's Teotihuacán pyramids
Luis Cortes/Reuters
ByAnne Laurent and Meredith Deliso
April 21, 2026, 8:41 PM

The man who opened fire at one of Mexico's busiest tourist sites was allegedly influenced by violent acts in the United States, Mexican officials said Tuesday.

The deadly mass shooting occurred late Monday morning at the Teotihuacan pyramids, an archaeological site outside of Mexico City. The shooter fired upon tourists from atop one of the pyramids while armed with a revolver that he reloaded at least twice before dying by suicide, according to José Luis Cervantes Martínez, the attorney general of the state of Mexico.

One person was killed and seven others wounded by gunfire, officials said. Several people also suffered injuries in the ensuing panic.

Mexican authorities work at the shooting scene at the Teotihuacan pyramids, a popular tourist and archaeological site on the outskirts of Mexico City, Mexico, April 20, 2026.
Luis Cortes/Reuters

"We all know that we had not seen anything like this in Mexico before," Mexican President Claudia Sheinbaum told reporters at a press briefing on Tuesday. "Based on information from the authorities, the individual showed signs of psychological issues and was influenced by incidents that occurred abroad."

The gunman held a plastic bag containing 52 rounds of ammunition during the attack, according to Cervantes Martínez. The shooter also had a bladed weapon on him and handwritten materials reportedly related to violent incidents believed to have occurred in the U.S. in April 1999, the attorney general said.

The shooting occurred on the same day as the 1999 Columbine High School massacre. 

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"Evidence collected so far suggests a psychopathic profile of the attacker, characterized by a tendency to imitate violent acts that occurred in other places and at other times," Cervantes Martínez said at Tuesday's press briefing. "This phenomenon, known as a 'copycat' effect, is one of the lines of investigation in this case, as materials referencing violent acts and figures associated with such behavior were found."

The gunman, identified as Julio César Jaso Ramírez, is not linked to organized crime and appears to have acted alone in a premeditated act, officials said. 

"Investigative findings indicate that the attack was not spontaneous. The attacker had previously visited the archaeological site on several occasions, stayed in nearby hotels, and from there planned and carried out his actions," Cervantes Martinez said. 

A man holds a weapon during an incident at the Teotihuacan pyramids, a popular tourist and archaeological site in San Martin de las Piramides, on the outskirts of Mexico City, Mexico, April 20, 2026.
Barak Hardley via Reuters
A gun, ammunition and knife are seen at the scene of a shooting at the Teotihuacan pyramids in an image that is being examined by law enforcement as part of their investigation.
Obtained by ABC News

The first report of an armed individual at the tourist site came at 11:20 a.m., officials said. State police and the Mexican National Guard responded and were also attacked. While returning fire, the gunman was shot in the leg by the National Guard, officials said. He shot himself while being subdued and died from a self-inflicted gunshot wound, officials said.

One person -- a Canadian woman -- was fatally shot and seven others suffered gunshot wounds during the attack, authorities said. Six others were also injured, such as from falls, in the incident, authorities said. Those injured were from Brazil, Canada, Colombia, the Netherlands, Russia and the U.S., officials said.

Red Cross personnel transport a body at the Pyramid of the Moon in the Teotihuacan archaeological zone following a shooting in Teotihuacan, State of Mexico, April 20, 2026.
Mexican Red Cross/AFP via Getty Images

Sheinbaum said authorities are investigating how the attacker was able to enter the site with a weapon.

In the wake of the deadly shooting, Mexico will be increasing security at archaeological sites and other public locations across the country by increasing the presence of the Mexican National Guard and installing screening equipment, the president said.

"In light of this event, it is necessary to strengthen inspections to prevent anyone from entering an archaeological site or public space with a firearm," Sheinbaum said.

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