The head of the African Union observer mission in Zimbabwe has said the elections were "free, honest and credible," the BBC reports.
Olunsegun Obasanjo said the incidents reported during Wednesday's poll, including allegations of widespread fraud and thousands of voters being turned away during polling, could not "change the outcome."
Members of Zimbabwe's opposition say they have been targeted by Mugabe supporters following the president's re-election.
President Robert Mugabe's declaration as winner has been met by international concern over the conduct of the African nation's poll.
Robert Mugabe has secured his grip on power in Zimbabwe today after his party ZANU PF won a majority in parliament in Wednesday's election.