Bahrain said on Nov. 11 that an explosion which caused a fire at its main oil pipeline on Nov. 10 was caused by "terrorist" sabotage, linking the unprecedented attack to Iran, Reuters reported. A key Western ally and host to the U.S. Fifth Fleet, Sunni Muslim-ruled Bahrain has for years grappled with protests and sporadic violence coming from its Shiite majority. Iran denies any role in the Gulf island kingdom's unrest.