Robert Mackey is live-blogging:

My colleague Nazla Fathi writes that authorities have arrested at least 100 protesters in the city of Mashad, the opposition Web site Jaras reported. The site also reports that 20 people were arrested in the city of Shiraz. According to large numbers of Basij militia members were deployed in both cities ahead of the anniversary. She also notes that a report on the opposition Web site Kaleme said that Basijis attacked Zahra Rahnavard, the wife of opposition leader Mir Hussein Moussavi, at a rally on Thursday, punching her and beating her with batons. The site also reported that the militia members surrounded Mr. Moussavi, a former prime minister, and prevented him from marching along the same route he had taken during the celebration in previous years.

(Video via Enduring America)

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