Tehran police commander Azizollah Rajabzadeh said "about 35 people… were arrested for vandalising public property" during Friday's rally in Tehran, according to ISNA news agency.
Tens of thousands of supporters of Iranian opposition leaders had mounted protests during the annual pro-Palestinian rally on Friday during which several protesters clashed with hardliners and security forces.
It was the first such protest by opposition supporters in two months against President Mahmoud Ahmadinejad's disputed June 12 election victory.
Similar mass protests had rocked Tehran immediately after the election and in the initial crackdown, 4,000 people, including top reformists, political activists, and journalists, were arrested.
About 140 of them have been put on mass trials before a Tehran revolutionary court, which the opposition denounces as a "show trials."
