Authorities continue to carry out forensic work in Mexico's Teotihuacán archaeological zone after a gunman shot and killed a 32-year-old Canadian woman and injured 13 people. 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 said. The gunman fatally shot himself after a standoff with police. Tap the link in @BBCNews’s bio to read more about the incident. #Mexico #Teotihuacán #BBCNews