TOPSHOTS Shiite Muslim pilgrims walk through the Iraqi holy city of Najaf on their way to Karbala on November 30, 2015, where they will take part in the Arbaeen religious festival marking the 40th day after Ashura which commemorates the seventh century killing of Prophet Mohammed's grandson, Imam Hussein. Iraq has increased security around Shiite areas aiming at reducing the risk of suicide bomb attacks by the Islamic State (IS), an extremist Sunni group which controls parts of Iraq and considers Shiites heretics. AFP PHOTO / HAIDAR HAMDANI