Tehran’s chief prosecutor, Abbas Jaffari Doulatabadi, said that Mr Karroubi would be tried by a special ecclesiastical court. No specific charges were outlined but they could run from inflatable criminal libel to the much more serious charge of “propagating against the Islamic system” which can bring long prison terms.
Similar prosecutions against other opposition leaders could be used to try to wipe out the top tier of the movement.
On Saturday, the official Iranian news agency announced that three defendants convicted for their roles in election protests had been sentenced to death for membership of banned opposition groups. Human rights groups dispute whether they were involved in the protests. Two of the men were said to inflatable water games have been in custody before the election.
Navi Pillay, the UN High Commissioner for Human Rights, called on Iran to repeal the death sentences, pointing to flaws in the secret prosecutions. Under international rules that Iran signed, the death penalty can be applied only in circumstances involving serious crimes.
“The imposition of the death penalty for crimes that do not result in loss of life is contrary to” the International Covenant on Civil and Political Rights, Ms Pillay said.
No charges have yet been brought against members of the Iranian security forces despite vidence of their role in the brutal suppression of the protests and vows by the inflatable tent Supreme Leader Ayatollah Khamenei that any wrongdoers would be held to account.
The Iranian government put the official death toll in the protests at 35 and blamed the fatalities on other demonstrators. Human rights and opposition groups say the toll is double that, laying responsibility mostly with the Basij volunteer militia.
In a further sign of rifts within the Iranian elite, the daughter of an aide to President Ahmadinejad defected to the West yesterday. Narges Kalhor, a film-maker, applied for asylum while attending a festival in Germany. Her father, Mahdi Kalhor, advises Mr Ahmadinejad on cultural matters.