Police made a few arrests but the anniversary of Iran's controversial election was quiet Sunday after organizers had cancelled a planned protest for lack of permit, state media said.
ISNA news agency quoted the deputy chief of police Ahmad-Reza Radan saying that "despite propaganda by the enemies," there were no protests or unrest in Tehran, but some "suspects" were arrested.
He gave no further details.
Opposition leaders Mir-Hossein Moussavi and Mehdi Karroubi called off the demonstration after failing to get a permit from the Interior Ministry, dpa reported.
Anti-riot police were deployed in several districts of the capital, especially near the central Tehran University, a standard gathering point for government opponents.
One year ago, President Mahmoud Ahmadinejad won re-election amid widespread allegations of vote fraud that resulted in mass street protests.
The 2009 unrest led to the deaths of more than 30 dissidents, and the opposition claimed the death toll to be over 80. Thousands of demonstrators were arrested.
More than 100 protestors, including journalists, artists and former reform-oriented ministers and parliamentary deputies, received long jail terms. Two monarchists were executed. Six other dissidents are currently on death row.