VIDEO:  Thousands of Shiite Afghans marked the holy day of Ashura in Kabul on Monday by taking part in ritual flagellation. The day is commemorated by Muslims around the world who mourn the death of Imam Hussein, the grandson of the Islamic Prophet Mohammad at the Battle of Karbala. ATTENTION: VIDEO CONTAINS GRAPHIC IMAGES OF SELF-FLAGELLATION WHICH SOME VIEWERS MIGHT FIND OFFENSIVE. Duration: 00:32