Protesters apprehend a riot police officer during protests over the missing 43 trainee teachers in Chilpancingo November 11, 2014. Members of the CETEG (State Coordinator of Teachers of Guerrero) teachers' union clashed with riot police during protests in reprisal for the killing of 43 trainee teachers after the government said corrupt police in league with a local drug gang abducted and apparently murdered the students in the southwestern state of Guerrero in late September. REUTERS/Daniel Becerril (MEXICO - Tags: CRIME LAW CIVIL UNREST EDUCATION POLITICS TPX IMAGES OF THE DAY)