A truck set on fire was used to break open one of the entrances of the governor's house in Chilpancingo, Guerrero state on October 29, 2014, by teachers protesting for the 43 students missing since September 26. Mexican authorities have searched in vain for any trace of the college students who disappeared on September 26. The country recoiled in fresh horror Tuesday over the discovery of yet another mass grave, in the futile monthlong search for 43 missing college students.AFP PHOTO/ JESUS GUERRERO (Photo credit should read JESUS GUERRERO/AFP via Getty Images)
