Nigeria, Oct. 27 -- Cameroon's longtime leader, Paul Biya, has been declared the winner of the country's 12 October presidential election, extending his rule into a fifth decade, according to official results.

Mr Biya's announcement came amid widespread allegations of electoral fraud and growing political tensions.

The Constitutional Council on Monday announced that the 92-year-old president had secured 53.66 per cent of the vote, defeating his main challenger and former minister, Issa Bakary, who garnered 35.19 per cent.

The council said voter turnout stood at 57.76 per cent, significantly lower than the 67 per cent average recorded over the last three elections.

The result gives Mr Biya, the world's oldest head of state, an eighth c...