UN Secretary-General Antonio Guterres (L) attends a ceremony to commemorate his fallen colleagues during the 2003 attack targeting the UN Assistance Mission in Iraq, at the UN headquarters in New York, Aug. 17, 2018. UN Secretary-General Antonio Guterres on Friday laid a wreath at the UN headquarters for his colleagues killed in the Aug. 19, 2003 attack in Iraq that prompted the designation of the International Humanitarian Day. (Xinhua/Li Muzi)