Tunisian President Zine-al-abdeen bin Ali opened here today a seminar on human civilizations and cultures, organized by the Islamic Educational, Scientific and Cultural Organization (ISESCO). A number of dignitaries and senior officials including Saudi minister of Hajj Dr Fu'ad al-Faresi, Arab League's secretary general Amr Mousa, secretary general of Jeddah-based Organization of the Islamic Conference Ekmel-Eddin Ughlo and Former Malaysian Premier Mahathir Mohammed are participating in the 3-day seminar.