A painter works on a portrait of one of the missing 43 students of Ayotzinapa Teacher Training College, in Ayotzinapa , in the southern Mexican state of Guerrero on October 26. The students went missing in Iguala, in the southwestern state of Guerrero on September 26 after clashing with police and masked men. Authorities fear that the 43 missing trainee teachers could have been massacred by police in league with gang members. Reuters/Daniel Becerril