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A rebel fighter keeps watch over the Karm al-Jabal neighbourhood of Syria's northern city of Aleppo on May 25, 2014. Aleppo was once Syria's economic hub, until it became consumed by violence after a major rebel onslaught in July 2012 that has split the city into opposition and regime-held territories. AFP PHOTO/AMC/ZEIN AL-RIFAI (Photo credit should read ZEIN AL-RIFAI/AFP/Getty Images)

A rebel fighter keeps watch over the Karm al-Jabal neighbourhood of Syria's northern city of Aleppo on May 25, 2014. Aleppo was once Syria's economic hub, until it became consumed by violence after a major rebel onslaught in July 2012 that has split the city into opposition and regime-held territories. AFP PHOTO/AMC/ZEIN AL-RIFAI        (Photo credit should read ZEIN AL-RIFAI/AFP/Getty Images)