A file picture taken on April 23, 2015, shows Tanzanian businessman Mohammed Dewji at his office in Dar es Salaam. - Africa's youngest billionaire was kidnapped on October 11, 2018, by gunmen in Tanzania's economic capital Dar es Salaam, officials said. Dewji, 40, who heads the MeTL Group which operates in about 10 countries with interests in agriculture to insurance, transport, logistics and the food industry, was snatched as he entered the gym of a hotel in the city. (Photo by Khalfan SAID HASSAN / AFP)