EDITORS' NOTE: Reuters and other foreign media are subject to Iranian restrictions on their ability to film or take pictures in Tehran.
A painter touches up a mural of martyrs' Mousavi and Shirazi (R) on a wall in Tehran March 10, 2011. REUTERS/Caren Firouz (IRAN - Tags: POLITICS SOCIETY) 

Demonstrators hold a picture of reformist candidate for Iranian presidential elections Mirhossein Moussavi during a demonstration in support of the Iranian opposition in Paris June 17, 2009. REUTERS/Philippe Wojazer (FRANCE POLITICS) 

Demonstrators attend a protest in support of defeated Iranian presidential candidate Mirhossein Mousavi in Vienna June 16, 2009. Iran's top legislative body on Tuesday ruled out annulling a disputed presidential poll that has prompted the biggest street protests since the 1979 Islamic revolution but said it was prepared for a partial recount. REUTERS/Leonhard Foeger (AUSTRIA CONFLICT POLITICS ELECTIONS) 

A demonstrator shows a picture of former presidential candidate Mirhossein Mousavi during a rally in support of Mousavi near the Azadi (Freedom) monument, western Tehran June 15, 2009. REUTERS/Caren Firouz (IRAN POLITICS ELECTIONS IMAGES OF THE DAY) 

A supporter of former presidential candidate Mirhossein Mousavi holds a campaign poster and a piece of green cloth during a rally in Tehran, June 15, 2009. Green is the symbolic colour of Mousavi's campaign. REUTERS/Morteza Nikoubazl (IRAN) 

A supporter of former presidential candidate Mirhossein Mousavi flashes victory sign while holding a campaign poster during a rally in Tehran, June 15, 2009. REUTERS/Morteza Nikoubazl (IRAN POLITICS ELECTIONS) 

A supporter of former presidential candidate Mirhossein Mousavi holds a placard upside down while attending a rally in Tehran, June 15, 2009. REUTERS/Morteza Nikoubazl (IRAN POLITICS ELECTIONS CONFLICT) 

A supporter of defeated presidential candidate Mirhossein Mousavi holds up a photograph of him while attending a rally in Tehran June 15, 2009. REUTERS/Morteza Nikoubazl (IRAN POLITICS ELECTIONS) 

A poster of Iran's moderate presidential candidate Mirhossein Mousavi is seen in the ground in Tehran June 13, 2009. Hundreds of supporters of President Mahmoud Ahmadinejad and moderate challenger Mousavi clashed in Tehran on Saturday after a landslide victory for Ahmadinejad in a presidential election, a Reuters witness said. REUTERS/Ahmed Jadallah (IRAN POLITICS ELECTIONS IMAGES OF THE DAY) 

A veiled Iranian woman walks past an election poster of presidential candidate Mirhossein Mousavi, an Iranian former prime minister, in central Tehran June 13, 2009. Hardline President Mahmoud Ahmadinejad resoundingly won Iran's election, preliminary official results showed on Saturday, but his moderate challenger alleged irregularities and claimed victory for himself. REUTERS/Damir Sagolj (IRAN POLITICS ELECTIONS IMAGES OF THE DAY) 

A man looks out from the Iranian Consulate at the queue of people waiting to vote there, in London June 12, 2009. Iranians streamed to polling stations Friday in a hotly contested election and a senior ally of Mirhossein Mousavi said the moderate candidate was on track to defeat hardline President Mahmoud Ahmadinejad. REUTERS/Toby Melville (BRITAIN POLITICS ELECTIONS IMAGES OF THE DAY) 

A supporter of Iran's presidential candidate and former Prime Minister Mirhossein Mousavi wraps a green cloth around his face during a rally in Tehran June 10, 2009. Green is the campaign colour of Mousavi. REUTERS/Morteza Nikoubazl (IRAN POLITICS ELECTIONS) 

A supporter of Iran's presidential candidate Mirhossein Mousavi wears a T-shirt with his picture during a campaign rally in Tehran under the Azadi (Freedom) monument June 10, 2009.REUTERS/Ahmed Jadallah (IRAN POLITICS ELECTIONS) 

A campaign worker and supporter of Iran's former prime minister and presidential election candidate Mirhossein Mousavi adjusts a campaign banner that reads "Our share for change", on a wall of a election campaign centre for Mousavi in Tehran June 9, 2009. REUTERS/Morteza Nikoubazl (IRAN POLITICS ELECTIONS) 

Supporters of Iran's upcoming presidential election candidate Mirhossein Mousavi attend an campaign rally in Tehran June 9, 2009. REUTERS/Ahmed Jadallah (IRAN POLITICS ELECTIONS) 

Supporters of former Prime Minister Mirhossein Mousavi, who is a candidate for the upcoming presidential elections show victory signs during a pre-election gathering at a stadium in Tehran June 9, 2009. REUTERS/Damir Sagolj (IRAN POLITICS IMAGES OF THE DAY ELECTIONS) 

An Iranian woman supporting former prime Minister Mirhossein Mousavi, who is a candidate for the upcoming presidential elections, covers her face with his picture during a pre-election gathering at a stadium in Tehran June 9, 2009. REUTERS/Damir Sagolj (IRAN POLITICS ELECTIONS IMAGES OF THE DAY) 

Supporters of Mirhossein Mousavi hold pictures of the presidential candidate during an election rally at a stadium in south Tehran June 8, 2009. REUTERS/Raheb Homavandi (IRAN POLITICS ELECTIONS IMAGES OF THE DAY) 

Iran's presidential election candidate Mirhossein Mousavi (L) attends an election campaign as a supporter shouts her support of him at a stadium in southern Tehran June 8, 2009. Iranians vote on June 12 in an election that pits hardline President Mahmoud Ahmedinejad against two moderate challengers and one fellow conservative. REUTERS/Raheb Homavandi (IRAN POLITICS ELECTIONS IMAGES OF THE DAY) 

A supporter of former prime minister and presidential election candidate Mirhossein Mousavi flashes victory signs during the formation of a human chain from north to south Tehran June 8, 2009. Iranians vote on June 12 in an election that pits hardline President Mahmoud Ahmedinejad against two moderate challengers and one fellow conservative. REUTERS/Morteza Nikoubazl (IRAN POLITICS ELECTIONS) 

Supporters of Iranian presidential candidate Mirhossein Mousavi hold campaign posters while they form a human chain from north to south Tehran June 8, 2009. Iranians vote on June 12 in an election that pits hardline President Mahmoud Ahmedinejad against two moderate challengers and one fellow conservative. REUTERS/Caren Firouz (IRAN POLITICS ELECTIONS) 

Former Prime Minister Mirhossein Mousavi, who is a candidate for the upcoming presidential elections looks through the window of his bus as he departs the stadium in the city of Karaj, 50 km west of Tehran June 6, 2009. REUTERS/Caren Firouz (IRAN POLITICS ELECTIONS) 

A supporter of former Prime Minister and Iran's upcoming presidential election candidate Mirhossein Mousavi holds a campaign poster during an election campaign at a stadium in Ardabil 839 km (524 miles) north-west of Tehran, June 1, 2009. REUTERS/Morteza Nikoubazl (IRAN POLITICS ELECTIONS IMAGES OF THE DAY) 

A supporter of Iranian Presidential candidate and former Prime Minister Mirhossein Mousavi holds up a campaign poster at an election rally on the streets of north Tehran June 1, 2009. REUTERS/Caren Firouz (IRAN POLITICS ELECTIONS) 

A supporter of Iranian Presidential candidate and former Prime Minister Mirhossein Mousavi holds a campaign poster at an election rally on the streets of north Tehran June 1, 2009. REUTERS/Caren Firouz (IRAN POLITICS ELECTIONS) 

Supporters of Iranian former Prime Minister and upcoming presidential election candidate Mirhossein Mousavi hold hands under a screen with Mousavi's image during an election campaign at a stadium in Tehran, May 23, 2009. REUTERS/Morteza Nikoubazl (IRAN POLITICS ELECTIONS) 

A supporter of former Iranian Prime Minister and upcoming presidential election candidate Mirhossein Mousavi stands under electoral posters at Mousavi's campaign centre in Tehran, May 23, 2009. REUTERS/Morteza Nikoubazl (IRAN POLITICS ELECTIONS) 

Former Iranian Prime Minister and reformist candidate for Iranian presidential elections Mirhossein Moussavi arrives for a meeting with economists in Tehran April 16, 2009. REUTERS/Raheb Homavandi (IRAN POLITICS) 

Former Iranian Prime Minister and reformist candidate for Iranian presidential elections Mirhossein Moussavi (C) arrives for a meeting with economists in Tehran April 16, 2009. REUTERS/Raheb Homavandi (IRAN POLITICS) 

Former Iranian Prime Minister and reformist candidate for Iranian presidential elections Mirhossein Moussavi arrives for a meeting with economists in Tehran April 16, 2009. REUTERS/Raheb Homavandi (IRAN POLITICS) 

Former Iranian Prime Minister Mirhossein Moussavi waves to journalists after speaking at a news conference in Tehran, April 6, 2009. Iranian President Mahmoud Ahmadinejad's main moderate challenger at the June presidential vote said on Monday he would adopt a conciliatory foreign policy towards the West unlike his "extremist" opponent. Prime minister during Iran's 1980-88 war with Iraq, Mirhossein Mousavi, 67, is seriously considered by many moderates and even some conservatives as their main presidential candidate and a strong rival to Ahmadinejad in the contest. REUTERS/Morteza Nikoubazl (IRAN POLITICS ELECTIONS HEADSHOT) 

Former Iranian Prime Minister Mirhossein Moussavi speaks with journalists at a news conference in Tehran, April 6, 2009. Iranian President Mahmoud Ahmadinejad's main moderate challenger at the June presidential vote said on Monday he would adopt a conciliatory foreign policy towards the West unlike his "extremist" opponent. REUTERS/Morteza Nikoubazl (IRAN POLITICS)