The Iranian news channel Press TV reported that they had been dispersed by security forces. It said the gathering, in Baharestan Square, had been planned in advance and there was a heavy police presence.
Severe reporting restrictions placed on the BBC and other foreign media mean many reports from the country cannot be verified independently.
12 June Presidential election saw incumbent Mahmoud Ahmadinejad re-elected with 63% of vote
Main challenger Mir Hossein Mousavi called for result to be annulled on grounds of electoral fraud
Street protests saw at least 17 people killed and foreign media restricted
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