The authorities in Mexico are still piecing together how a typical morning at the ancient pyramid complex of Teotihuacán, one of the country's foremost tourist destinations, descended into terrifying gun violence on Monday. The video footage is disturbing. A gunman stands atop the imposing Pyramid of the Moon and opens fire on the tourists around him, who cower for cover among the pre-Hispanic stone structures.

After the ordeal, a 32-year-old Canadian woman had been killed and the gunman had died from a self-inflicted gun wound. Tourists from several nations, including Russia, Colombia and Brazil, were treated for their injuries in local hospitals. The fact that visitors from overseas were targeted poses a headache for the government just weeks before Mexico co-hosts the men's football World Cup.

The shooting came less than two months after masked gunmen from the Jalisco New Generation Cartel unleashed a wave of violence, sowing fear across the country following the killing of their leader 'El Mencho' by the security forces. But this incident was very different. Mexican authorities say the Teotihuacán gunman acted alone and there was no apparent link to Mexico's widespread cartel violence.

He has been identified as 27-year-old Julio César Jasso Ramírez, a Mexican citizen living in Mexico City. The aggressor planned and carried out the attack on his own and there is absolutely no indication at this point that he had any external help or that any other individuals were involved in this incident, said Attorney-General of Mexico State, José Luis Cervantes Martínez.

Among the gunman's belongings, officials found a handgun, a bag of cartridges, a tactical knife, and literature related to violent incidents, including references to the Columbine High School shooting.

Mexicans are no strangers to violence, with many massacres committed on Mexican soil typically involving rival drug cartels. However, the shooting at Teotihuacán appears to fall into a very different category altogether—mass killings carried out by solitary assailants.

This incident reflects a worrying trend in Mexican society as it grapples with both its internal issues of violence and the influence of mass shooting phenomena seen in other countries, notably the United States. Although the shooter seems to have acted out of individual grievances, the overall rise of violence and its implications for safety present a significant challenge as Mexico prepares to welcome the world for the upcoming World Cup.