More on ZimbabweZimbabwe's Movement for Democratic Change (MDC) leader, Morgan Tsvangirai, on Thursday demanded the unconditional release of detained party activists before a power-sharing deal with Zanu-PF leader Robert Mugabe can be implemented. Tsvangirai told a news conference in South Africa that he remained committed to the power-sharing agreement signed by Zimbabwe's rival political parties in September, but said he lacked a credible partner.