Photos: First pilgrims of Great Arbaeen March from holy Najaf to Karbala

First pilgrims of the Great Arbaeen March 2016 from Najaf to Karbala****Millions of pilgrims have gathered in Iraq's holy city of Karbala to mark Arbaeen, a sacred Shia Muslim ritual. Arbaeen commemorates the end of the 40-day mourning period after the martyrdom of Imam Hussein(as), the Prophet Muhammad's grandson (as), in a battle against Yazid, tyrant caliph of his time.