Democratic Republic of Congo president Joseph Kabila has conceded there were mistakes in the election process following a disputed presidential poll last month. But he stressed the process was credible.
The BBC reports provisional figures showed Mr Kabila had won, but the Carter Center observer group said the results "lack credibility" and the Catholic archbishop of Kinshasa said they did not reflect "the truth".
At a news conference in the capital, Kinshasa, on Monday, Mr Kabila, 40, pointed to his own disappointing scores in the eastern provinces as proof that the election process had been transparent and said these elections were "far better" than those in 2006, when he was first elected.
Opposition leader Etienne Tshisekedi claimed victory for himself.
Four other opposition candidates have said the election was rigged and should be annulled.
Mr Kabila said he was not surprised by Mr Tshisekedi's declaration of himself as president, but he would press ahead with the task of governing DR Congo.