Students hold portraits of the 43 missing Ayotzinapa College Raul Isidro Burgos students during a march...
Students hold portraits of the 43 missing Ayotzinapa College Raul Isidro Burgos students during a march to mark the 34rd month since their disappearance in the state of Guerrero, in Mexico City, Mexico, July 26, 2017. REUTERS/Edgard Garrido