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People walk past debris next to the Saad Ansari school (background) in the northern city of Aleppo on April 12, 2015, following a reported Syrian regime air strike that killed five children and four other civilians, the Syrian Observatory for Human Rights said. AFP PHOTO / AMC / ZEIN AL-RIFAI (Photo credit should read ZEIN AL-RIFAI/AFP/Getty Images)

People walk past debris next to the Saad Ansari school (background) in the northern city of Aleppo on April 12, 2015, following a reported Syrian regime air strike that killed five children and four other civilians, the Syrian Observatory for Human Rights said. AFP PHOTO / AMC / ZEIN AL-RIFAI        (Photo credit should read ZEIN AL-RIFAI/AFP/Getty Images)