mexico city driver tour bus crash tuesday quiet road mexico yucatan peninsula kill 12 people may lose control one front tire explode local police chief say bus carry 31 passengers include citizens unite state brazil canada sweden trip mayan ruin crash flip authorities say aboard travelers royal caribbean cruise ship seem front tire bus explode make lose control leave asphalt carlos briceno villagomez head police municipality bacalar tell mexican tv network televisa tuesday night government quintana roo state say investigate cause accident happen flat stretch road appear involve another vehicle driver injure arrest mexican tour guide among kill local civil protection official say authorities also investigate whether human error contribute accident u.s. state department confirm wednesday multiple american citizens die crash mexican authorities say eight u.s. citizens die confirm deaths multiple u.s. citizens mexico bus accident several injuries express heartfelt condolences affect tragedy state department spokeswoman heather nauert say post twitter one canadian die crash three others injure spokesman canada global affairs department say two swedish citizens die two others injure mexican authorities say child among dead quintana roo one three state mexico yucatan peninsula major tourist destination burst tire may cause deadly tourist bus crash mexico -police