Ashura is the peak of 10-day mourning period for Imam Hussein, a grandson of the prophet Muhammad, who was killed in battle in the 7th century.
Dec. 5, 2011 Turkish Shiite people take part in a religious procession held for Ashura in Istanbul. Ashura commemorates the killing of Imam Hussein, a grandson of the prophet Muhammad, by armies of the caliph Yazid in 680 A.D. Tradition holds that the revered imam was decapitated and his body mutilated in the Battle of Karbala. Mustafa Ozer/AFP/Getty Images Buy Photo