BAGHDAD, April 3 (Reuters) - Iraqi Shi'ite cleric Moqtada al-Sadr called on Thursday for his followers to demonstrate in a million-strong march against U.S. "occupation" on April 9, the five-year anniversary of the fall of Baghdad.

"The time has come to express your rejections and raise your voices loud against the unjust occupier and enemy of nations and humanity, and against the horrible massacres committed by the occupier against our honourable people," said a statement released by Sadr's office in the holy city of Najaf.

Sadr's followers clashed with Iraqi and U.S. forces throughout the south of the country and Baghdad last week in the worst fighting Iraq has seen since at least the first half of 2007.

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