The Iranian opposition leader Mirhossein Mousavi is under 24-hour guard by secret police and no longer able to speak freely to supporters, according to the film director Mohsen Makhmalbaf.

Mr Makhmalbaf, 52, an informal spokesman abroad for the protest in Iran, said that Mr Mousavi was not under arrest but “he has security agents, secret police with him all the time. He has to be careful what he says.”

In a telephone interview, Mr Makhmalbaf, the director of the 2001 film Kandaha, denied suggestions that the protests against the re-election of President Mahmoud Ahmadinejad were losing steam.

“The regime, arguably, is losing ground, not the protests,” he said. “Ordinary Iranians are openly rejecting the legitimacy and power of Ayatollah Khamanei. That is entirely new, unheard of.”

Mr Makhmalbaf, a friend of Mr Mousavi for 20 years, said that there were reports from Iran that some of the militia deployed to suppress protest were “speaking Arabic”. “That is unconfirmed but it suggests that the regime is unable to trust its own security forces to repress the Iranian people,” he said. “It suggests that people are being used from abroad.”

Iranians have an affinity with Arabs because of their shared religion.  But beneath that veneer, lies two major rifts with Arabs:

- even within the religious affinity, Iranians are (like Iraqis, who are Arab) largely Shiite,
- nationalistically speaking, Iranias are Persians, ie. non-Arabs, and many still resent how the Muslims came to their country and imposed Islam onto them.

Any suggestion that the Regime is bringing in Arabs to fight off the Iranians taking to the street will backfire.

None of this is PC per se, but it is real: while an Iranian and an Arab will exchange pleasantries, an uneasy tension will exist between them, as well.