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Africans voiced their anger at a ceremony in Ghana to mark 200 years since Britain abolished the slave trade on Sunday, with some saying they could not forget how the "white man" maltreated their ancestors.

Ghana, which celebrated 50 years of independence from Britain this month, is commemorating the bicentenary with a ceremony at a white-washed former slave fort at Elmina with singers and performers from Africa, the Caribbean and London.

Many expressed outrage at the brutality of a trade that shipped more than 10 million -- some estimates say up to 60 million -- Africans into bondage. Many did not survive.