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Arbaeen: World's largest annual pilgrimage as millions of Shia Muslims gather in Karbala

Arbaeen: World's largest annual pilgrimage as millions of Shia Muslims gather in Karbala

Millions of pilgrims have gathered in Iraq's holy city of Karbala to mark Arbaeen, a sacred Shia Muslim ritual. Arbaeen, also known as Chehlum, commemorates the end of the 40-day mourning period after the killing of Imam Hussein, the Prophet Muhammad's grandson, in a battle in 680 AD. His martyrdom is considered a defining event in the schism between Sunni and Shia Muslims.