 Forced into exile in the 1970s, Saudi Shia leader Hassan al-Saffar is said to have been "powerfully influenced" by the works of Sunni Islamists of the Muslim Brotherhood and Jamaat-e-Islami and by their call for Islamic revolution and an Islamic state.Following the 1979 Iranian Revolution, Shia in Hasa ignored the ban on mourning ceremonies commemorating Ashura.When police broke them up three days of rampage ensued—burned cars, attacked banks, looted shops—centered around Qatif.