People take part in a march commemorating four months of the disappearance of 43 students from Ayotzinapa, on January 26, 2015, at the Zocalo square in Mexico City. The students went missing on September 26, in an apparent massacre by a police-backed gang that sparked nationwide protests and caused a crisis for President Enrique Pena Nieto. For now, only one of the students has been positively identified from charred remains, which leaves little hope of finding the 42 others --what it would rank among the worst mass murders in a drug war that has killed more than 80,000 people and left 22,000 others missing since 2006 in Mexico. AFP PHOTO / ALFREDO ESTRELLA (Photo credit should read ALFREDO ESTRELLA/AFP/Getty Images)
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AFP ALFREDO ESTRELLA