Rio Tinto Chief Executive Tom Albanese and Chinalco President Xiao Yaqing sign a document during a meeting in London
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In this file photo Rio Tinto Chief Executive Tom Albanese (R) and Chinalco President Xiao Yaqing sign a document during a meeting in London February 12, 2009. Rio Tinto said on Tuesday four of its employees in Shanghai had been detained by the Chinese authorities.