Pilgrims walk from Baghdad to Karbala for Arbaeen religious festival Thousands of pilgrims begin the 90 km walk from Baghdad to the holy city of Karbala for the Arbaeen religious festival, which commemorates the seventh century killing of the Prophet Mohammed's grandson Imam Hussein. The key Shiite commemoration, which draws millions of pilgrims, comes after nearly a week of violent demonstrations starting October 1 in which more than 100 Iraqis died, mostly protesters killed by live ammunition fired into the crowds. \\n IMAGES AND SOUNDBITES