Riot police guard outside a supermarket to prevent Ayotzinapa Teacher Training College students from looting it in Chilpancingo, in the southern Mexican state of Guerrero

Riot police guard outside a supermarket to prevent Ayotzinapa Teacher Training College students from looting it in Chilpancingo, in the southern Mexican state of Guerrero

Riot police guard outside a supermarket to prevent Ayotzinapa Teacher Training College students from looting it in Chilpancingo, in the southern Mexican state of Guerrero, October 25, 2014. A group of Ayotzinapa Teacher Training College students broke into supermarkets and looted them as a form of protest to demand answers from the government over the 43 missing students of the college, local media reported. Authorities fear that the 43 missing trainee teachers could have been massacred by police in league with gang members. The students went missing in Iguala, in the southwestern state of Guerrero on September 26 after clashing with police and masked men. REUTERS/Jorge Dan Lopez (MEXICO – Tags: CRIME LAW EDUCATION POLITICS CIVIL UNREST)