Iranian Shiite Muslims mourn during Ashoura ritual, commemorating the 7th century martyrdom of Prophet Muhammad's grandson, Hussein, in the battle of Karbala in present-day Iraq, at the old main bazaar of Tehran, Iran, Tuesday, July 16, 2024. Shiites represent over 10% of the world's 1.8 billion Muslims and view Hussein as the rightful successor to the Prophet Muhammad. (AP Photo/Vahid Salemi)