Shiite Muslim pilgrims walk on the outskirts of the Iraqi capital Baghdad towards the southern Iraqi city of Karbala on October 24, 2018, ahead of the Arbaeen religious festival, which marks the 40th day after Ashura, commemorating the seventh century killing of Prophet Mohammed's grandson, Imam Hussein. / AFP / SABAH ARAR
Shiite Muslim pilgrims walk on the outskirts of the Iraqi capital Baghdad towards the southern Iraqi city of Karbala on October 24, 2018. AFP

Bus carrying Iranian pilgrims in Iraq comes under attack