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Syrian children attend a class at a primary school in Aleppo's rebel-held eastern district of Shaar on May 7, 2016. Displaced families returned home and schools reopened in rebel-held districts of Aleppo after a truce was extended for 72 hours in the battleground northern city. / AFP / KARAM AL-MASRI (Photo credit should read KARAM AL-MASRI/AFP/Getty Images)

Syrian children attend a class at a primary school in Aleppo's rebel-held eastern district of Shaar on May 7, 2016.
Displaced families returned home and schools reopened in rebel-held districts of Aleppo after a truce was extended for 72 hours in the battleground northern city. / AFP / KARAM AL-MASRI        (Photo credit should read KARAM AL-MASRI/AFP/Getty Images)