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Pakistani civil society activists place lighted candles during a vigil in Lahore on December 18, 2014, for the children and teachers killed in an attack by militants on an army-run school in Peshawar. Students grieving for their classmates massacred by the Pakistani Taliban Thursday vowed to defy the militants and return to school as soon as possible. AFP PHOTO / Arif ALI (Photo credit should read Arif Ali/AFP/Getty Images)