A student shouts slogans during a march to mark the ninth anniversary of the disappearance of 43 students of the Ayotzinapa teaching training school, in Mexico City on September 26, 2023. The whereabouts of 40 of the 43 students of the Ayotzinapa case and the motives behind the crime at the hands of drug traffickers -allegedly linked to the military- still remain unknown, although it has been attributed to the Guerreros Unidos cartel and police in their service. (Photo by ALFREDO ESTRELLA / AFP)