Mexico Teotihuacan Shooting

The gunman who opened fire on tourists at Mexico’s iconic Teotihuacan pyramids carried materials that were apparently related to the deadly 1999 shooting at Columbine High School. That's according to authorities who spoke Tuesday, a day after the attack that killed a Canadian woman and left at least 13 people injured. Although officials did not mention Columbine by name, they referred to several books and handwritten notes that belonged to the gunman and referenced attacks in the United States in April 1999. Monday marked the 27th anniversary of the massacre in Colorado. The assailant, who authorities said acted alone, shot and killed himself.