Tens of thousands of people turned out in the Iranian capital to demonstrate their opposition to the result of last Friday's presidential election, which they believe was rigged.
The demonstrators, mostly supporters of the main opposition candidate Mir Hossein Mousavi, marched peacefully through the city, despite an official ban.
Many held placards reading "Where is my vote?" - a reference to about a million votes missing from the count that saw incumbent President Mahmoud Ahmadinejad declared a winner.
Protesters wore green, Mr Mousavi's campaign colour, or black in memory of at least eight people known to have been killed at the end of a rally on Monday.
The march was reported to have taken place in near silence, in an attempt to counter government accusations of hooliganism.
In an apparent show of support for the opposition movement, six footballers for Iran's national team wore green armbands for a World Cup qualifier match against South Korea in Seoul.
Fans attending the match also used the occasion to hold their own protests.
The fans waved Iran's national flag and held up banners saying "Free Iran" and "Go to hell dictator".
The football protest were among several shows of support around the world, including one by a group that took over the Iranian pavilion at the Venice Art Biennale.
Mr Mousavi has appealed for people to remain peaceful and said Thursday should be a day of mourning for those killed.
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