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The Saudi government has refused to allow Shiite teachers and students exemption from school to partake in activities for the Day of Ashura, one of the most important religious days for Shiites which commemorates the martyrdom of Muhammad's grandson, Husayn bin Ali, at the hands of the second Sunni Umayyad Caliph, Yazid. In 2009, during Ashura commencements, Shia religious and community leaders were arrested protesting against the government and chanting slogans against Wahhabis.