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Some of the pilgrims in the Iraqi capital's northern neighborhood of Kadhimiyah, where the 8th century Imam Moussa al-Kadhim (AS) is buried, are pounding their chests in grief while others are carrying a symbolic coffin of the imam, wrapped in a green cloth.
The annual commemoration events culminate on Tuesday, the Associated Press reported.
Security forces have blocked major roads in Baghdad to protect the pilgrims, who have been making their way on foot this week to the shrine.
But Daesh (ISIL) terrorists have still managed to launch several attacks, including a car bombing Monday that killed 18 pilgrims.