Shiite Muslim worshippers beat themselves inside the holy shrine of Imam Hussein to mark the Muslim festival of Arbaeen in Karbala, 50 miles south of Baghdad, on Thursday, Jan. 3 , 2013. The holiday marks the end of the 40-day mourning period after the anniversary of the seventh-century martyrdom of Imam Hussein, the Prophet Muhammad's grandson. (AP Photo/ Hadi Mizban)

Photo by: Hadi Mizban

Shiite Muslim worshippers beat themselves inside the holy shrine of Imam Hussein to mark the Muslim festival of Arbaeen in Karbala, 50 miles south of Baghdad, on Thursday, Jan. 3 , 2013. The holiday marks the end of the 40-day mourning period after the anniversary of the seventh-century martyrdom of Imam Hussein, the Prophet Muhammad's grandson. (AP Photo/ Hadi Mizban)