A man holds up a placard reading "It was the State" during a protest to demand justice for the 43 missing students of the Ayotzinapa Teacher Training College Raul Isidro Burgos, near Los Pinos presidential residence in Mexico City December 31, 2014. Mexican authorities on December 7 said that mounting evidence and initial DNA tests confirmed that 43 trainee teachers who were abducted in Iguala by corrupt police on September 26 were incinerated at a garbage dump by drug gang members. REUTERS/Tomas Bravo (MEXICO - Tags: CIVIL UNREST CRIME LAW EDUCATION SOCIETY)