Shiite pilgrims march to Karbala for the Arbaeen celebration in Baghdad, Iraq, Monday, Dec. 31, 2012. Each year, hundreds of thousands converge on the southern city of Karbala to mark the end of the forty day mourning period following the anniversary of the 7th century death of the Prophet Muhammad's grandson, Imam Hussein. (AP Photo/ Karim Kadim)

Associated Press
Shiite pilgrims march to Karbala for the Arbaeen celebration in Baghdad, Iraq, Monday, Dec. 31, 2012. Each year, hundreds of thousands converge on the southern city of Karbala to mark the end of the forty day mourning period following the anniversary of the 7th century death of the Prophet Muhammad's grandson, Imam Hussein. (AP Photo/ Karim Kadim)
Shiite pilgrims march to Karbala for the Arbaeen celebration in Baghdad, Iraq, Monday, Dec. 31, 2012. Each year, hundreds of thousands converge on the southern city of Karbala to mark the end of the forty day mourning period following the anniversary of the 7th century death of the Prophet Muhammad's grandson, Imam Hussein. (AP Photo/ Karim Kadim)
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