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Yemenis inspect the rubble of a school destroyed by a Saudi-led air strike on the outskirt of the northwestern Saada province, on September 14, 2016. / AFP / STRINGER (Photo credit should read STRINGER/AFP/Getty Images)

Yemenis inspect the rubble of a school destroyed by a Saudi-led air strike on the outskirt of the northwestern Saada province, on September 14, 2016. / AFP / STRINGER        (Photo credit should read STRINGER/AFP/Getty Images)