Nane Annan (2nd R, front), widow of former United Nations Secretary-General Kofi Annan, lays a wreath during Annan's state funeral in Accra, Ghana, on Sept. 13, 2018. A number of African and world leaders joined Ghanaian President Nana Akufo-Addo here on Thursday to bid farewell to former United Nations Secretary-General Kofi Annan, who passed away in Switzerland on Aug. 18. (Xinhua/Fred Bonsu)