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2.05pm:
Mousavi should now be arrested for calling for banned rallies to go ahead, according to a senior politician cited by Reuters.

"Mousavi's calling for illegal protests and issuing provocative statements have been a source of recent unrests in Iran ... Such criminal acts should be confronted firmly," said Ali Shahrokhi, head of parliament's judiciary committee, semi-official Fars news agency reported.

"The ground is paved to legally chase Mousavi."

@TheGuardian

1,000+ pro-reform Iranians have gathered in 7 Tir Square despite government warnings and more ppl coming, news reports say #IranElection less than 10 seconds ago from web

RT RT Iran: In 7 Tir ppl were quietly assembled, forces attacked them, clashes started and are still happening. #iranelection #gr88 #neda

"In the current sensitive situation ... the Guards will firmly confront in a revolutionary way rioters and those who violate the law," said a statement published on the Guards' website.

@Reuters

1.55pm:
Two helicopters are hovering above Hafte Tir Square and there is a heavy security presence on the street, according to an eyewitness. The police and basij militia are stopping people on the street and asking where they are going, the witness said.
@TheGuardian

REVOLUTION MARTYRS

Reuters has confirmed that 1,000 people have gathered for an opposition rally in central Tehran in defiance of a ban on the protest and threats from the Revolutionary Guard.

1.35pm:
General Ali Fazli, recently appointed as commander of Seiyed al-shohada of the Revolutionary Guards in Tehran province, has been arrested for refusing to carry Khamenei's order to use force against demonstrators, according to an unconfirmed report on the Balatarin, spotted by Robert Tait.

Earlier reports suggested that Fazli, who lost an eye during Iran's war with Iraq, had been sacked for his non-compliance. He is said to have been taken to an unknown location after his "arrest". Could this be a first sign of a split among the upper echelons in the security forces?

@TheGuardian

1.05pm:

A group of Dutch students and academics is setting up a project to encourage organisations to allow their computer servers to be used as proxy servers for people in Iran to get round Iranian restrictions.

"Since it is summer a lot of businesses and institutions like university's have their servers running at well beneath their normal capacity. This means that they have ample bandwidth," emails David Suurland, one of the organisers.

He adds: "It costs next to nothing to do and requires little effort but is of tremendous importance for the Iranians capability to organize themselves without the fear of detection.

"We have our ways of distributing the resulting anonymous proxy addresses to the people involved."

@TheGuardian

The Koran & The Ballot Box

Zahra Rahnavard takes leadership role in Iran's opposition movement