Millions from around the world gather in Iraq for Arbaeen

Millions of people have made the journey to the Iraqi city of Karbala to participate in the Arbaeen walk. It marks the 40th day of mourning after Ashoura, the day that Husayn, the grandson of Prophet Muhammad, was killed. It's not a required act of worship, but it still attracts people of all ages from around the globe. The World's Sara Hassan was there.

This story originally aired in September 2023.