The gunman who opened fire atop Mexico's ancient Pyramid of the Moon appeared to have been influenced by other violent shootings and showed signs of psychological problems, the country's president said on Tuesday. Julio César Jasso Ramírez, 27, a Mexican national, carried a handgun, dozens of cartridges, a knife, and literature referencing acts of violence, officials reported. Mexico's top prosecutor stated that Jasso Ramírez planned and executed the attack alone, eventually taking his own life after a standoff with police. The shooting resulted in the death of a Canadian woman and injuries to 13 others at the popular tourist site northwest of Mexico City. Witnesses reported that Jasso Ramírez mentioned the 1999 Columbine High School massacre during the attack. Investigators found literature among his belongings connected to this tragic event. Following the incident, the archaeological site was temporarily closed but is scheduled to reopen with increased security, including metal detectors at entrance points. President Claudia Sheinbaum emphasized safety measures for upcoming public events, assuring that it is safe to visit Mexico.