Millions of Shia Muslims have gathered in Karbala for the holy festival of Arbaeen, marking the 40th day of mourning the martyrdom of Imam Hussein.
![Arbaeen Karabala 2016 [Getty]](/sites/default/files/styles/image_156x88/public/media/images/FD1FF679-9463-4FF0-BC5B-F6BCC9A7196E.jpg?h=d1cb525d&itok=sbG0KgT- "Arbaeen Karabala 2016 [Getty]")
![Iraq airport [Getty]](/sites/default/files/styles/image_156x88/public/media/images/641D82E8-8404-4573-BB07-3ED89BAA3525.jpg?h=d1cb525d&itok=sE8jC6hP "Iraq airport [Getty]")
![Pilgrims mark Arbaeen in Iraq [Getty]](/sites/default/files/styles/image_156x88/public/media/images/FCCED9A3-1D8F-4625-A580-8FABC090017B.jpg?h=d1cb525d&itok=hTfmCAdi "Pilgrims mark Arbaeen in Iraq [Getty]")
