Four more "clandestine" mass graves housing burnt bodies have been found in Iguala, Mexico, reports Reuters, and they're "relatively" close to six others discovered last weekend. Four suspects led investigators to the graves yesterday; it isn't clear how many bodies the graves contain, AFP reports. The suspects "say there are remains of students," Mexico's attorney general says. Officials have been searching for some 43 missing students who were last seen hauled into vehicles after clashing with police late last month, the BBC reports. Two men have since confessed to executing 17 students and depositing them in one of the graves found on Saturday. Police are now attempting to identify the victims with DNA samples from students' relatives.
Mexican officials have yet to provide a motive for the killings, but as the students attended a teacher's college known for its left-wing activism, some say it may have been a political attack. Others say the murders were carried out by the Guerreros Unidos gang, which wanted extortion money. Yet another theory: that there's a connection between the vanishings and a speech the wife of Iguala's mayor was to give to local dignitaries; the two occurred on the same day, the BBC reports. Officials have now begun searching for fugitive mayor Jose Luis Abarca, his wife Maria de los Angeles Pineda Villa—whose late relatives were part of the Beltrán Leyva drug cartel, which formed Guerreros Unidos—and the local head of security. Some 34 people have now been detained, including 26 police officers who may have ties to gang members. (Read more Mexico stories.)