Palestinian children play in an alley in Balata refugee camp near the West Bank city of Nablus, ahead of Nakba Day, on May 14, 2019. The Nakba Day, or the Day of Catastrophe, is marked by the Palestinians on May 15 in memory of the forcible transfer of two thirds of the Palestinian people and ethnic cleansing of at least 418 villages as a result of the 1948 war. (Xinhua/Ayman Nobani)