Defeated reformist presidential candidate Mir Hossein Mousavi (C) raises his arms as he appears at an opposition demonstrate in Tehran on June 15, 2009, for the first time since an election that has divided the nation. Getty Images

TEHRAN, Iran (CNN) - Iran's defeated main opposition leader appeared at a rally Monday, the first time he has been seen in public since last week's elections which he says were rigged to give hardline President Mahmoud Ahmadinejad overwhelming victory.
Iranian opposition supporters protest in Tehran on Monday.

Reformist Mir Hossein Moussavi, whose claims of fraud in Friday's vote have fueled three days of unrest and prompted authorities to launch a probe, spoke to supporters in Tehran's Freedom Square using a loudspeaker, and clasped his hands over his head as the crowd cheered.

Wearing a striped shirt and smiling, he appeared confident, despite official election results showing that President Mahmoud Ahmadinejad convincingly won Friday's election.

Hundreds of thousands of people turned out for the demonstration, said Amir Mehdi Kazemi, a reporter for the Iranian government-backed station.

CNN Chief International Correspondent Christiane Amanpour saw a pair of four-wheel drive vehicles - believed to be transporting Moussavi to the rally –pass at high speed to join the march, one with security officials hanging off the car and the other with a camera.

Crowds shouted "Moussavi! Moussavi!" as they passed.

There was little or no chanting of political slogans among the marchers, with demonstrators quieting anyone who tried to shout, Amanpour said, because the Interior Ministry has banned political demonstrations.

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Watch: Moussavi emerges at rally
Related: Would Moussavi make a difference?

[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2009/images/05/05/costello.mugshots.art.jpg caption= "Carol Costello says some newspapers are publishing arrest photos - and it's paying off."]

From CNN's Bob Ruff

There was a time when a mug shot was, well, just a mug shot.

Remember the Watergate arrestees? H.R. Haldeman was Richard Nixon’s chief of staff. He was arrested for, and later convicted of, conspiracy and obstruction of justice. Haldeman’s mug shot was typical of the times. His pose was expressionless and the photo was fairly grainy and totally unremarkable.

The chances of anyone actually seeing a mug shot back then were pretty slim, unless the arrested person was famous, or infamous, and authorities passed on the photo to the newspapers or TV.

And today? Welcome to the wide world of mug shots.

Topping the list may well be tampabay.com, the web site of the St. Petersburg Times. At any given moment they show online the mug shots of latest three people booked in the four counties in the Tampa Bay area. “As this technology has emerged,” says Hillsborough County, Florida Lieutenant Jim Previtera, “when a crime occurs they’re pretty quick to want to get the mug shot and they’ve been able to do it off our public web site.”

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Here are the big stories on the agenda today:

• Breaking now:  The only Somali pirate to come off the lifeboat alive was brought to New York early this morning.  He could be in court today.  The young man, known in official documents as "Pirate Defendant" was said to be all smiles.  He was one of four who held Captain Richard Phillips at gunpoint for five days at sea.  U.S. Navy snipers shot and killed the other three.
• UFO believers to Obama: release the X-files!  You've heard about the scores of special interest groups appealing to President Obama in his first 100 days in office.  Now you can add believers in UFOs to the list.  They're calling on the president to end what they insist is a government cover-up of the existence of extraterrestrials.
• Racism, Iran Style.  Iranian President Mahmoud Ahmadinejad took the stage Monday in Geneva at the U.N.'s Racism conference, and pointed fingers at Israel, the U.S., and western Europe. He also went after the United States for its war in Afghanistan. Several nations, including the U.S. and Israel, boycotted the U.N. Conference.  Representatives of many other nations walked out.  Protesters in clown wigs made a lot of noise.
• A urine test for Lung Cancer? Someday, a simple urine test might spot smokers at highest risk for lung cancer, according to a new study.  Dr. Sanjay Gupta joins us with the potential breakthrough.
• African-American Princess.  In 1937 Snow White was the first Disney princess to be featured on the big screen.  Since that time Disney has introduced eight princesses, but this year they make history with their first black princess.   Cultural watchers see this as a milestone and a symbol of a culture-changing standard of feminine beauty.  Others draw a connection to the Obamas being in the White House, and as a result see the image of the princess resonating even more with the public – a sort of perfect storm of African-American cultural imagery.