In the nine months since the “Rio four” were arrested in Shanghai on charges of taking bribes and stealing commercial secrets, speculation has ranged widely on the Chinese government's motivations in the case.
Of many complex political explanations, the favourite is the allegation that the arrests were payback for Rio Tinto's tough stance in talks on iron ore sales with the Chinese steel industry last year.
Rio, which has spent months conducting its own investigation of what happened, has never commented on details of case.
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