Shiite Muslims are commemorating Ashoura, marking the 7th-century death of Prophet Muhammad’s grandson, Hussein, that gave birth to their faith.

The rift between Islam’s two main sects deepened after Sunnis killed Imam Hussein in battle in the Iraqi city of Karbala, south of Baghdad, in 680. It continues to play a key role in shaping the identity of Shiites, who represent over 10% of the world’s 1.8 billion Muslims.

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