ISTANBUL, May 21, 2016 - United Nations Under-Secretary-General for Humanitarian Affairs and Emergency Relief Stephen O'Brien(R) and Turkish Foreign Minister Mevlut Cavusoglu talk during a flag raising ceremony of World Humanitarian Summit in Istanbul, Turkey, on May 21, 2016. The first-ever World Humanitarian Summit will be held in Turkey's largest city Istanbul from May 23 to 24, 2016.

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