Iran´s Guardian Council has declared dispute over recent presidential elections over, after recounting 10 percent of the ballots on Monday.
Ahmadinejad is considered a representative of the country´s ultra-conservatives and a close disciple of Supreme Leader Ayatollah Ali Khamenei.
Mousavi is a leading representative in Iran´s reformist camp and is considered by many observers as the main challenger to Ahmadinejad.
Karroubi, the current chairman of the National Trust Party, is regarded as a pragmatist reformist in Iran´s political scene.
Rezaei, currently the secretary of the Expediency Discernment Council, is considered by many observers as a moderate conservative candidate in the upcoming presidential election.
Voting has started in polling stations across Iran in the country´s presidential election.
Mir Hossein Mousavi has denounced the result, saying there were violations and vote-rigging during the election. His supporters took to the streets and clashed with police in the capital Tehran.
The official Iranian news agency IRNA has reported the Iranian airforce has scheduled an extensive exercise in the Persian Gulf and the Sea of Oman for today.
