His shirt was emblazoned with a phrase associated with a subculture that glorifies the Columbine massacre Julio Cesar Jasso (27) wounded 13 people, including six Americans, and killed a Canadian woman, authorities confirmed.The incident happened at the archaeological site’s Pyramid of the Moon, 40km from the centre of Mexico City, at about 11.30am on Monday.Jasso was the only gunman and died by a self-inflicted gunshot wound, authorities told the Associated Press.According to Mexican outlet Telediario, the AI photo left at the site appeared to show Jasso posing with Eric Harris and Dylan Klebold, the two teenagers who killed 14 people...