The party said the conspiracy involved the African Union, ECOWAS the Commonwealth, and the British High Commission in Sierra Leone.
Mr. Mahama was leading a Commonwealth Elections Observation Mission in the country.
“International Observers have no capacity to change the will of the people, in any election. I, John Dramani Mahama, have no interest in who governs the people of Sierra Leone. The long nights, early mornings, long meetings, diplomatic shuttles were all aimed at helping Sierra Leone choose their leader freely, maintain the peace and consolidate their democracy,” Mr. Mahama stated.
Mr. Mahama notably intervened in the conflict between the supporters of the main opposition party, the Sierra Leone Peoples Party (SLPP) led by Mr. Bio, and the police during the first round of elections in March.
Mr. Bio, a former military coup leader, received the most votes in the first round when he faced ruling party candidate, Samura Kamara.
Mr. Maada Bio received 43.3 percent of the vote, but was unable to reach the 55 percent mark thus necessitating a run-off which was held on March 31.