President Muhammadu Buhari's Chief of Staff, Mallam Abba Kyari, has died more than two weeks after he tested positive for COVID-19. Special Adviser to the President on Media and Publicity, Mr Femi Adesina, announced Mr Kyari’s death on Twitter. The President’s spokespersons, Mr Garba Shehu, also tweeted about the development, disclosing that Kyari died