Zimbabwe President Robert Mugabe and the main opposition leader, Morgan Tsvangirai, are due at this weekend's emergency summit of southern African leaders, summoned by the president of neighboring Zambia, to discuss the electoral and political crisis, spokesmen for the two men said.
Preparations for the summit came as Zimbabwe's main opposition party claimed victory Thursday for Tsvangirai in last month's disputed presidential election and ruled out taking part in a runoff vote against Mugabe.
The secretary-general of Tsvangirai's Movement for Democratic Change, Tendai Biti, warned that the opposition would not accept a second round of voting. 
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CNN's Nkepile Mabuse in Johannesburg contributed to this report.
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All About Zimbabwe • Robert Mugabe • Morgan Tsvangirai