Mexico official: Teotihuacán gunman carried material related to US mass shooting  BBCMexican authorities say attack that killed Canadian tourist at pyramids was ‘not spontaneous’  CTV NewsMexico to beef up security at tourist sites after shooting at pyramids in lead up to World Cup  Toronto StarCarney mourns Canadian killed in Mexico shooting witness calls ‘horrible’  Global NewsGunman who fired on tourists at Mexican pyramid carried materials related to 1999 Columbine massacre  AP News