Shi'ite pilgrims pray at the Imam Abbas shrine in Karbala, 50 miles south of Baghdad, Iraq, Sunday, Jan. 23, 2011, as faithful flock to the holy city for Arbaeen, marking the end of the forty-day mourning period after the anniversary of the 7th century martyrdom of Imam Hussein, the Prophet Muhammad's grandson. (AP Photo/Ahmed al-Husseini)

Photo by: Ahmed al-Husseini

Shi'ite pilgrims pray at the Imam Abbas shrine in Karbala, 50 miles south of Baghdad, Iraq, Sunday, Jan. 23, 2011, as faithful flock to the holy city for Arbaeen, marking the end of the forty-day mourning period after the anniversary of the 7th century martyrdom of Imam Hussein, the Prophet Muhammad's grandson. (AP Photo/Ahmed al-Husseini)