Photo Gallery The Green Wave in Iran

Tens of thousands hit the streets of Teheran again on Thursday according to eyewitness accounts. The world's media, however, has been prohibited from joining them. This image is of a protester on Wednesday.

Demonstrators supporting Mir Hossein Mousavi, the opposition candidate who was allegedly defeated by President Mahmoud Ahmadinejad in elections last Friday, have clogged city streets in Tehran and other major Iranian cities for days.

The Iranian opposition is convinced that the election results showing Ahmadinejad as the winner are a fraud.

Marchers on Wednesday with an oversized photo of opposition leader Mousavi. On Thursday, Mousavi supporters held a day of mourning for those who have died in the protests. Iranian officials have said that seven protesters have lost their lives. The opposition fears that dozens are dead.

Mousavi's supporters say that Ahmadinejad stole the vote from the opposition. Officially, the incumbent received 62.6 percent of the vote. A great many Iranians disagree.

Former Parliament President Mehdi Karrubi also took part in the protests on Wednesday. He was also on the presidential ballot and came in fourth place -- with 0.85 percent of the vote. The fact that he received the same low total in his hometown has led him to suspect that the results were manipulated.

Thursday is the day of the week when Iranians traditionally mourn their dead, which is why Mousavi chose the day to mourn those demonstrators who have been killed in the protests. Eyewitnesses say that thousands descended on mosques across the country.

Photo material from Iran has become extraordinarily difficult to obtain, with journalists either thrown out of the country or prohibited from doing their job. This photo was distributed via Twitter. It shows damage done at a Tehran University dormitory following post-election day clashes.

So far, official Iran has been largely silent about the protests. On Friday, however, Ayatollah Khamenei is set to deliver an address.

Green is the official color adopted by the Mousavi campaign. The protests are the biggest in Iran since the revolution in 1979.

The only images currently coming out of Iran are from official sources. This picture was released by the government-run Fars News Agency on Wednesday and shows a supporter of opposition leader Mousavi.

Demonstrators on Wednesday in Tehran. The photo was distributed by Reuters after it was sent to them via their platform "Your View."

Mousavi supporters have said they will not give up and have promised to stage more marches in the coming days.