JIM LEHRER: And still to come on the NewsHour tonight: sharing software and servers; the fighting in Afghanistan; and poet Jim Harrison.
That follows the still-simmering tensions in Tehran. NewsHour correspondent Kwame Holman begins our coverage.
KWAME HOLMAN: After more than 10 days of relative but restive calm, protestors were back in the streets of Tehran today, nearly a month after the disputed election that returned Mahmoud Ahmadinejad to power.
With a virtual media blackout in place, amateur video posted on YouTube and similar Web sites showed demonstrations in the capital. The hallmark cries of the Islamic revolution -- shouts of "Death to the dictator" and "God is great" -- once again filled the air.
Today also marked the 10th anniversary of a violent crackdown on student protests at Tehran University. Authorities warned of a crushing response to unrest, and again today riot police and militia dispersed crowds.
A state-sponsored TV network described the scene.
NEWS REPORTER: Police used tear gas in one locality to disperse the crowd. Security has been tight in the streets of downtown Tehran Thursday, but onlookers did gather in numbers to watch the demonstrations.
KWAME HOLMAN: Other reports said today's demonstrations attracted a few thousand people. That is much smaller than the gatherings of hundreds of thousands last month in support of opposition candidates, especially Mir Hossein Mousavi, who said the election was rigged in Ahmadinejad's favor.
Last night, the Iranian president said the accusations of fraud were baseless.
MAHMOUD AHMADINEJAD, president,Iran (through translator): In the recount of the vote, no fault was discovered, and basically those who had claims couldn't even provide one document as a proof of fraud in the election. The whole nation understood this, although we don't expect ordinary people to provide proof, but it is not acceptable from those who claim to be politicians.
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