The Guardian's live-blog has a translation of an eyewitness account:
I was in Sadeghiyeh and though people were not holding up any symbols, I think most of them were against the regime because they wouldn't respond to the official chants from the loudspeakers.
The security forces attacked the crowd violently, with cables, batons, and gas. Where I was, I can say that the 22 Bahman celebrations did not take place. I saw a small gathering of regime supporters and even they were dispersed by the police.
The people were beaten and I even saw some seriously injured individuals. That's what happens when you're attacked with chains. But no shots were fired.