Tens of thousands of opposition supporters in Iran have taken to the streets yet again, in protests over disputed election results.
Opposition leader Mir Hossein Mousavi had urged his supporters to continue their protests, on what he had declared a day of mourning for those killed in the unrest.
Correspondents say the protesters largely maintained a "dignified silence", with no chanting or shouting along the route of the march.
Mr Mousavi, dressed in black, made an appearance in the middle of the crowds. Eyewitnesses said he used a loudspeaker to address his supporters.
Many of the protesters followed Mr Mousavi's request that they dress in black, as a symbol of mourning. From within the crowds many have sent in pictures to the BBC showing the scale of the protest.
People at the march said there was little sign of the pro-government militia reported to have been involved in recent violence, but that protesters were nevertheless warned to stay close together.
Incumbent President Mahmoud Ahmadinejad has been declared the winner, but supporters of the opposition candidates say the election was rigged in his favour.
The latest protests came as Iran's powerful Guardian Council said it was investigating 646 complaints about the election from the three defeated candidates.
Foreign journalists are officially banned from attending the events, but thousands of the protesters have been taking images and posting them on the internet.
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