UN officials bid farewell to former Secretary-General Kofi Annan

The United Nations flag flies at half mast in memory of the late former UN Secretary-General Kofi Annan, at the UN headquarters in New York, on Aug. 18, 2018. Officials from across the UN system paid tribute to Kofi Annan, who passed away on Saturday at the age of 80 in a Swiss hospital. (Xinhua/Li Muzi)