Into the night:
9:15 p.m. According to the BBC, witnesses report streetlights being cut off and security forces beating people under cover of the dark.
The latest from EA:
1900 GMT: A Tehran witness to Reza Sayah of CNN (1630 GMT): "Thousands security forces block protester path to Azadi Square on Azadi Avenue. Security forces beat protesters in side streets."
1850 GMT: Senior Mousavi advisor, Ardeshir Amirarjomand, has told the BBC that security forces prevented the participation of Mir Hossein Mousavi and Zahra Rahnavard, but Greens have participated with great numbers and the regime has learned suppression is no longer effective.
1840 GMT: RAHANA claims that security forces have beaten a number of students of Sharif University in Tehran.
1835 GMT: Footage has been posted which claims to be of a night-time protest in Shiraz.
1830 GMT: Mardomak reports that 10,000 security personnel are preventing people from spending the night in Azadi Square.
1825 GMT: An EA correspondent brings up to date, "Electricity interrupted along Enghelab [Avenue], ostensibly to ease repression. BBC has also posted unconfirmed report of two people being wounded by gunfire." He warns, "All very ugly and leading to increased repression in next few days. Expect a new wave of arrests to begin tonight or tomorrow."
Mehdi Saharkhiz is tweeting countless more clips.