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TOPSHOT - Yemeni children play in a camp for internally displaced people on the outskirts of the southern city of Taez on January 11, 2017.
In November 2015 the World Health Organisation said 2.1 million people have been internally displaced by the conflict between Iran-backed rebels and government forces supported by a Saudi-led coalition. / AFP / Ahmad AL-BASHA (Photo credit should read AHMAD AL-BASHA/AFP via Getty Images)