By Jon Herskovitz JOHANNESBURG (Reuters) - South Africa's police anti-corruption unit said on Friday it had opened an investigation at state oil company PetroSA, which reported "deviations" in financial procedures that a newspaper said involved millions of dollars of irregular payments. In an investigative report published on Friday, the weekly Mail & Guardian questioned payments made when PetroSA last year secured crude oil acreage in Ghana through the acquisition of Sabre Oil and Gas Holding Ltd. ...

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