Thousands of angry supporters of the New Patriotic Party (NPP) demonstrated at the Kwame Nkrumah Circle in Accra on Tuesday against the presidential results of December 7.
The results pronounced President John Dramani Mahama of the ruling National Democratic Congress victorious.
The demonstrators were singing party songs and criticising Dr Kwadwo Afari-Gyan, Chairman of the Electoral Commission (EC) for declaring President Mahama as president-elect.
The EC pronounced the president winner of Election 2012 with 50.7 per cent votes, while the NPP candidate, Nana Addo Dankwa Akufo-Addo had 47.74 per cent.
There is a heavy presence of security at the Circle, as the NPP supporters await the arrival of the leadership of the party, who have concluded a crunch meeting.
The leadership of the party says it will petition the Supreme Court to challenge the results since it has evidence that they were manipulated.
The leadership of the party said they had ample evidence that the results as declared did not reflect the true picture of what happened during the election on Friday.
The evidence would be given to a team that would work with the legal team of the party to challenge the results.
The African Union observer group and Coalition of Domestic Election Observers said the 2012 elections were relatively free, fair and peaceful. GNA