Tunis, Sha'ban 22, 1435, Jun 20, 2014, SPA -- Tunisian President Moncef Marzouki will start a tour today to four sub-Saharan African countries, namely Mali, Niger, Chad and Gabon. A statement issued yesterday by the Presidency of the Republic of Tunisia said that the visits aim at enhancing economic relations with Tunisia. --SPA 10:55 LOCAL TIME 07:55 GMT www.spa.gov.sa/w