Shi'ite Muslim pilgrims gather as they commemorate Arbain in Kerbala, southwest of Baghdad December 12, 2014. Hundreds of thousands of black-clad pilgrims from across Iraq streamed into the city of Kerbala on Friday a day before the culmination of Saturday's Arbain, which marks the end of 40 days of mourning for Imam Hussein, a grandson of the Prophet Mohammed, who died in a 7th century battle at Kerbala. REUTERS/Mushtaq Muhammed(IRAQ - Tags: RELIGION SOCIETY)