Relatives and friends of the 43 missing students from Ayotzinapa take part in a demonstration in Iguala, Guerrero State, Mexico, on September 27, 2015, to commemorate the first anniversary of their disappearance. The students, from a rural teachers school in the southern state of Guerrero, disappeared after they were attacked by local police in the city of Iguala on September 26, 2014. AFP PHOTO/RONALDO SCHEMIDT        (Photo credit should read RONALDO SCHEMIDT/AFP/Getty Images)