Since Al-Hasa and Qatif were conquered and annexed into the Emirate of Riyadh in 1913 by Ibn Saud, Shiites in the region had experienced state oppression. Unlike most of Saudi Arabia, Qatif and much of the Eastern Province has a Shiite majority, and the region is also being of key importance to the Saudi government due to it both possessing the bulk of Saudi oil reserves as well as the main Saudi refinery and export terminal of Ras Tanura, which is situated close to Qatif.[1]