The Ashura ceremonies, which mark the death of a venerated figure in Shiite Islam, come amid a months-long surge in violence nationwide that has forced Baghdad to appeal for help from Washington in combating militancy.
The bloodshed over the two days that mark the peak of Ashura struck across Iraq, with separate bombings targeting gatherings of Shiites in a restive province north of Baghdad, and a procession tent south of the capital.
A car bomb also targeted a Shiite man distributing food in the northern city of Kirkuk, leaving eight wounded yesterday.
Shiites from Iraq and around the world mark Ashura, which this year climaxes today, by setting up procession tents where food is distributed to passers-by and pilgrims can gather.
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Some two million will make the pilgrimage, often on foot, to the Iraqi city of Karbala, which is home to a shrine to Imam Hussein.
Tradition holds that the venerated imam was decapitated and his body mutilated.
To mark the occasion, modern-day Shiite mourners flood Hussein's shrine, demonstrating their ritual guilt and remorse for not defending him by beating their heads and chests and, in some cases, making incisions on their scalps with swords in rituals of self-flagellation.
Today, black-clad pilgrims packed the shrines of Hussein and his half-brother Abbas, listening over loudspeakers to the story of the battle in which Hussein was killed as volunteers distributed food and water.