Teheran, 21 July-(ANA)-Iranian riot police are reported to have arrested a number of pro-reform protesters in Tehran after demonstrations turned violent.
Police clashed with hundreds of people marching despite a ban on public gatherings since the disputed election in June, Reuters news agency said.
The re-election of President Mahmoud Ahmadinejad sparked widespread protests and allegations of vote-rigging.
Defeated candidate Mir-Hossein Mousavi has continued to contest the result.
Mr Mousavi has issued statements opposing the election result, saying detention of protesters would not end opposition.
A reformist former prime minister of Iran, he has received backing from several senior figures within the Iranian establishment.
Among them are two former presidents, Hashemi Rafsanjani and Mohammad Khatami.
On Monday Mr Khatami called for a referendum on the legitimacy of the government.
Mr Khatami, quoted on Iranian websites, said millions of Iranians had lost faith in the electoral process.(ANA)