Tsvangirai's Movement for Democratic Change (MDC) cried foul after Zimbabwe's electoral body announced on Friday that he had won 47.9 per cent of the vote but faces a run-off after failing to gain enough votes for an outright majority.

The MDC described the announcement of the long-delayed result as 'scandalous daylight robbery'. It says Mr Tsvangirai won more than 50 per cent of the vote in the March 29 election and Mr Mugabe's 28-year rule is over.

But Mr Mugabe's old foe has few options. If Mr Tsvangirai refuses to take part in a second round, Mr Mugabe would keep his hold on power according to electoral law. The MDC said it would decide at the weekend whether to contest a run-off.

An aide to Mr Mugabe said the president accepted the result of the first round and would contest a run-off.

'The presidential result as announced do not reflect the genuine expression of the will of the Zimbabwean people given the many anomalies, malpractices, deflation of figures relating to ZANU-PF candidates,' chief election agent Emmerson Mnangagwa told reporters.

Western powers expressed doubt that a run-off could be fair.

'For any second round of the presidential election to be considered free and fair ... an end of violence as well as the presence of international observers is of crucial importance,' said a statement by current European Union president Slovenia.

Chief Elections Officer Lovemore Sekeramayi said Mr Tsvangirai won 47.9 per cent with Mr Mugabe, who has ruled since independence from Britain, on 43.2 per cent. Independent Simba Makoni, a ruling party defector, took 8.3 per cent.

'Since no candidate has received the majority of the total votes cast ... a second election shall be held on a date to be announced by the commission,' Mr Sekeramayi said.

The Zimbabwe Electoral Commission (ZEC) will set the date of the run-off which should by law be held within 21 days of the result. But the ZEC has the power to extend this and political observers say a 40-day period is likely. -- REUTERS