Iran's Supreme Leader Ayatollah Ali Khamenei has ordered the Guardian Council to investigate the claims of fraud in the recent presidential election, state television reported on Monday.

Referring to the defeated reformist presidential candidate Mir- Hossein Mousavi's appeal letter for the irregularities and the cancellation of the election result, Khamenei said that "the Guardian Council has been emphasized to carry out investigation into this letter carefully."

In a meeting with Mousavi on Sunday evening, Khamenei also told the former prime minister to pursue his appeal against the election result in a legal way, the report said.

"You are different from those people (rioter protestors on the streets) and you are advised to keep manners and calmness," Khamenei said.

On Saturday afternoon, Iran's Interior Minister Sadeq Mahsouli announced that the incumbent President Mahmoud Ahmadinejad won 62. 63 percent of the total votes during Friday's vote, while former Prime Minister Mir-Hossein Mousavi got 33.75 percent in Iran's presidential competition.

Mousavi has appealed for Iran's Guardians Council to cancel the country's June 12 presidential election result, a statement posted on his website said on Sunday.

"Today, I wrote a letter to the Guardian Council asking them to cancel the result of the recent (presidential) election," Mousavi said in the statement.

Iran's Supreme Leader has urged supporters of both the winner and the defeated candidates to avoid provocative behavior.

(Xinhua News Agency June 15, 2009)