Federal policemen atop a vehicle patrol along a road outside Iguala, in the southwestern state of Guerrero, November 4, 2014. On Sept. 26, 43 students went missing from Guerrero. Initial testimony from investigators has suggested that the students, who belong to an all-male leftist college, had a history of conflict with the Iguala mayor and that the city police had handed them over to local gangsters who killed them. REUTERS/Henry Romero (MEXICO - Tags: CRIME LAW POLITICS CIVIL UNREST)