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Indian Shiite Muslims take part in a self-flagellation ritual during a religious procession of the Ashura mourning period in New Delhi on December 17, 2010. The religious festival of Ashura, which includes a ten-day mourning period starting on the first day of Muharram on the Islamic calendar, commemorates the seventh-century slaying of Prophet Mohammed's grandson Imam Hussein in Karbala...Photograph by: Niklas Halle'n CHI-photo/Rex Features