TOPSHOTS A policeman stands guard outside the burnt Government Palace in Chilpancingo, Guerrero state on October 14, 2014 the day after students set it on fire during a protest to demand the finding of the 43 mates missing since an attack by rogue officers earlier this month. Authorities are investigating whether the students were buried in mass graves found outside Iguala, a city 200 kilometers (125 miles) south of Mexico City. AFP PHOTO / Yuri CORTEZ