Teotihuacán gunman carried Columbine-linked materials, authorities say

Mexican authorities say the Teotihuacán pyramid shooter acted alone, carried a handgun, ammunition, a knife, and documents referencing violence including the Columbine massacre, and showed psychological problems; he fatally shot himself after a standoff, a Canadian tourist was killed and 13 others injured, and the government pledged reinforced security and metal detectors at sites ahead of World Cup events.