According to Iranian state television, the country's Supreme Leader Ayatolla Ali Chamenei has ordered the powerful Guardian Council to examine allegations of election fraud. Opposition rallies were banned on Monday.
Amid widespread international criticism and days of unrest on the streets of Tehran, Iran's supreme leader has ordered a probe into the allegations of irregularities during Friday's vote.
Incumbent Mahmoud Ahmadinejad was delared winner with an overwhelming majority of more than 60 percent.
Opposition leader Mir Hossein Mousavi claims that Friday's polls were manipulated by widespread vote-rigging. He had called on Iran's top supervisory body, the Guardian Council, to nullify the election because of what he alleges were irregularities.
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The interior ministry and Ahmadinejad have dismissed the criticism.
Authorities ban opposition rally
Earlier on Monday, the country's interior ministry had banned an opposition rally planned planned for later that day.
"Some seditious elements had planned to hold a rally and by fabrication said they had permission from the interior ministry. Any disrupter of public security would be dealt with according to the law," a state radio announcement said.
