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A woman walks past a traffic patrol vehicle set ablaze by angry demonstrators during a protest demanding justice and clarification for the disappearance of 43 students from Ayotzinapa, in Chilpancingo, Guerrero State, Mexico, on January 15, 2015. Mexico's government Wednesday slammed as "baseless" military wrongdoing alleged by the parents of 43 college students missing and feared dead, rejecting the possibility of an investigation. Authorities say the 43 young men who were studying at a teacher's college were abducted by Iguala police officers on September 26 and delivered to the Guerreros Unidos drug gang, whose henchmen confessed to killing them. AFP PHOTO / Pedro PARDO (Photo credit should read Pedro PARDO/AFP via Getty Images)