A senior Revolutionary Guard accused President Mahmoud Ahmadinejad's pro-reform opponents of waging a "velvet revolution" in Iran, at the climax of a bitter presidential election campaign.
The comments were a further escalation in a war of words after Mr Ahmadinejad, facing a strong challenge from former Prime Minister Mirhossein Mousavi, accused his rivals of using Hitler-style smear tactics and said they could face jail.
The campaign has shown up divisions among leading figures in the Islamic Republic, between backers of the hardline incumbent and more moderate advocates of detente with the West, whose supporters have spilt on to the streets for boisterous rallies.
"The presence of supporters of Mirhossein Mousavi on the streets are part of the velvet revolution," said Yadollah Javani, head of the Guards' political office, using a term used to describe the 1989 non-violent revolution in Czechoslovakia.
"Any kind of velvet revolution will not be successful in Iran," he said in comments published on the Guards' website.
Mr Mousavi's supporters, dressed in his green campaign colour, have taken to the streets of Tehran for nightly rallies, waving flags and banners and shouting anti-Ahmadinejad slogans.
There have been sporadic clashes in the capital but the campaign for tomorrow's election has been largely peaceful.
Describing the moderates and reformists as "extremists," Mr Javani said they were "trying by launching a psychological media war to announce themselves as winner of this election."
Iran often accuses Western powers of seeking to undermine the Islamic state through a "soft" or "velvet revolution" with the help of intellectuals and others inside the country.
State television said that, as always at election time, all campaigning would be banned from this morning. Cars plastered with pictures and campaign material would be stopped and seized, he said.
Reuters