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A Syrian boy with his face covered in dust and traces of his tears stands in a street following an air strike by government forces on the rebel held Bustan al-Qasr district in the east of the northern Syrian city of Aleppo on September 20, 2015. AFP PHOTO / KARAM AL-MASRI (Photo credit should read KARAM AL-MASRI/AFP/Getty Images)

A Syrian boy with his face covered in dust and traces of his tears stands in a street following an air strike by government forces on the rebel held Bustan al-Qasr district in the east of the northern Syrian city of Aleppo on September 20, 2015. AFP PHOTO / KARAM AL-MASRI        (Photo credit should read KARAM AL-MASRI/AFP/Getty Images)