"After instability during the late 1990s, Bahrain undertook substantial political reforms, but the Shiite majority continues to simmer over the Sunni-led government's perceived manipulation of citizenship and election laws and regulations to maintain its grip on power. In late 2008, the power struggle manifested as large demonstrations and some arrests of Shiite opposition leaders. Smaller but frequent incidents of violence continued subsequently. These tensions are likely to increase in the run up to the next parliamentary elections, planned for November 2010."
CRS Report for Congress, 95-1013