Zimbabwe's rival opposition factions say they have reunited, declaring they have a majority in parliament.
The announcement was jointly made by Movement for Democratic Change (MDC) leader Morgan Tsvangirai and faction leader Arthur Mutambara.
The final results of parliamentary and presidential polls have still not been published - more than four weeks after the election.
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Representatives of presidential candidates are set to meet the electoral commission to review the results of the disputed election.
Mugabe 'cannot be president'
At a joint news conference in Johannesburg, South Africa, Mr Tsvangirai and Mr Mutambara announced that they were now working together.
This meant that President Mugabe's Zanu-PF party was now in the minority, they said.
Mr Tsvangirai also urged Mr Mugabe to concede that "he cannot be president".
The opposition announcement is a significant move, the BBC's Peter Greste in Johannesburg says.
And the announcement will also be a welcome boost for Mr Tsvangirai if he does face a run-off with Mr Mugabe to be president as is being predicted.
The MDC says 15 of its supporters have been killed in post-election violence.
More than 200 of its activists were arrested during a police raid on its Harare headquarters last Friday.
A judge has ordered that they should either be charged or set free, following an MDC petition.
(BBC)
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