Congo Republic President Denis Sassou Nguesso has won a new five-year term with 60.39 per cent of the vote, the interior minister says.
The win extends his long rule over the oil-producing nation that first began in 1979.
Interior Minister Raymond Zephyrin Mboulou announced the result on state television and said opposition leader Guy-Brice Parfait Kolelas, who is popular in the south of the capital Brazzaville, won 15 per cent in Sunday's vote, while retired general Jean-Marie Mokoko won 14 per cent.
Opposition candidates have alleged election fraud and said on Wednesday that their own results show Sassou Nguesso headed for defeat.
The government has imposed a blackout on internet and mobile phone communications since Sunday, and it also banned the use of motor vehicles nationwide during the vote itself.
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Sassou Nguesso came to power in 1979 and governed until 1992, when he lost an election. In 1997, he regained power after a civil war and then won elections in 2002 and 2009 at which there were allegations of fraud.
He campaigned this time on a promise to develop the country's infrastructure and commit a quarter of the state budget to education to tackle high youth unemployment in the nation of 4.5 million.
The 72-year-old pushed through changes to the constitution in a referendum last October to alter the term and age limits that would have barred him from standing for another five-year mandate.
