The official news agency IRNA, meanwhile, reported that 20 of the detained protesters would be tried next week.

The 20 are charged with being linked to terrorist groups, carrying guns and grenades, intentionally attacking police and the voluntary Basij forces, sending pictures to 'enemy media' and causing damage to public property.

The report added that some of the protesters were also linked to the rebel group People's Mujahideen of Iran and the Bahai religious sect.

Meanwhile, Moussavi and the head of the Etemad Melli party, Mehdi Karroubi, decided to hold a mourning ceremony for those killed in the protests at the Behesht Zahra cemetery in southern Tehran.

The website of the Etemad Melli party reported that after the interior ministry rejected a request by Moussavi and Karroubi to hold a memorial ceremony in central Tehran for the victims in recent protests, the two decided to hold the ceremony at the victims' graves in Behesht Zahra.

Though officials put the post-poll violence death toll at 20, parliament deputy Farhad Tajari told the ILNA news agency Tuesday that 30 people were killed in the recent demonstrations.

There was, however, no confirmation by other official sources on the death toll claimed by Tajari.