The idea of a U.N. envoy was strongly endorsed by Tendai Biti, secretary general of Zimbabwe's opposition Movement for Democratic Change. In an interview with Reuters Biti suggested Anna Tibaijuka, who visited Zimbabwe three years ago to investigate the Mugabe government's drive to demolish shantytowns.
POWER-SHARING DEAL?
In Washington, U.S. President George W. Bush told a news conference: "The will of the people needs to be respected in Zimbabwe, and it is clear that they voted for change as they should have because Mr. Mugabe has failed the country."
MDC leader Morgan Tsvangirai says he won the presidential election outright and there is no need for a run-off, but independent and ruling party projections pointed to a second round to decide the winner.
U.N. Secretary-General Ban Ki-moon said it was clear Tsvangirai had won.
Zimbabwe's U.N. ambassador suggested both sides would need to come up with a power-sharing deal in a national unity government. "There is no way anybody can do without the other," Boniface Chidyausiku told the BBC.
A win for Mugabe, whose ruling ZANU-PF party lost control of parliament in the election, would deepen Zimbabwe's economic collapse, political analysts say. But Western powers are likely to pour in aid and investment if victory goes to Tsvangirai.
Severe food, fuel and foreign currency shortages are worsening in Zimbabwe and there are no signs the inflation rate of 165,000 percent - the world's highest - will ease.
The Zimbabwe Electoral Commission invited presidential candidates and their agents to verify results from May 1. The process, which had been due to start on Tuesday, could still take another week before a result can be made public.
"This exercise will pave way for the announcement of the result of the presidential election," state radio said in a notice from the commission.
Mugabe has been under heavy international pressure over the delay and even the former guerrilla leader's old regional allies have shown signs of impatience. The European Union called on Tuesday for a global arms embargo on Zimbabwe.
Opposition supporters from Zimbabwe's rural areas described a campaign of arson and brutality against them since the ballot.
Thousands of people have fled their homes and the MDC says more than 15 of its supporters have been killed by ZANU-PF militants. The ruling party denies this.
A state newspaper, quoting a government statement, said one man was killed and two were injured when opposition supporters tried to attack an army camp. There was no immediate comment on the report from police or the MDC.
