Several independent observer groups have condemned the March 9-11 elections as deeply flawed and unfairly structured to ensure Mugabe's re-election.
South African President Thabo Mbeki and Nigerian President Olusegun Obasanjo arrived in Harare on Monday and met Mugabe at the State House mansion to discuss the conduct of the election and the future of Zimbabwe after two years of widespread violence blamed mainly on ruling party militants.
Both leaders were also expected to meet with opposition candidate Morgan Tsvangirai, according to his Movement for Democratic Change.
Mbeki, Obasanjo and Australian Prime Minister John Howard were scheduled to meet Tuesday in London to discuss possible actions against Zimbabwe by the 54-nation Commonwealth of Britain and its former colonies.
The Commonwealth observer mission said the election did not adequately allow voters to freely express their choice. Industrialized Commonwealth nations have called for Zimbabwe's expulsion for abusing the group's charter on democratic rights.
Since Mugabe was declared the winner of the elections last week, white farmers have reported an upsurge in violence in farming districts.
A white farmer was shot dead near Norton, about 30 kilometers west of Harare early Monday in an assault on his homestead by suspected ruling party militants, the Commercial Farmers Union said.
He was the tenth white farmer killed since militants began violent occupations of white-owned land in two years ago.
Terry Ford, 51, contacted neighbors late Sunday and reported a group of about 20 militants were besieging his home, union spokeswoman Jenni Williams said.
Ford smashed his car into a farm fence to make a getaway but was dragged from the vehicle and shot in the head against a tree in an execution-style killing, the union said.
Ford's political affiliation was not immediately known.
"There is great concern there has been more activity in the last week in terms of evicting farmers and looting homes across the country," said Williams.
White farmers have been accused of providing transport and logistical backing for the opposition Movement for Democratic Change, the biggest-ever threat to Mugabe's rule. Ruling party militants have occupied more than 1,700 white farms, and the government has announced plans to nationalize about 4,500 white-owned properties for redistribution to landless blacks.
Mugabe won the presidential vote with a disputed 56 percent of votes to Tsvangirai's 42 percent.
However, the opposition party said it was to release election statistics Monday that differ greatly with those announced by the government.
The MDC said in a statement that official figures from the state Electoral Commission showed the MDC getting more votes than those announced and the ruling party less in up to 50 of the 120 voting districts.
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