The Head of State and Government, President Emmerson Mnangagwa has left for the Forty-Eighth (48th) Ordinary Session of the Executive Council of the African Union (AU) which kicked off Wednesday at the AU headquarters in Addis Ababa, Ethiopia, with a strong call for enhanced unity, sustainable development and collective action to address the continent’s pressing challenges. He was seen off by the two Vice Presidents, General (Rtd) Dr Constantino Chiwenga and Colonel (Rtd) Dr Kembo Mohadi and several senior government officials at the Robert Gabriel Mugabe International Airport, Harare.