For a banned demonstration called off by the opposition candidate, this looks pretty big. New York Times says “hundreds of thousands,” i.e., more than came to see Obama in Berlin.

Government apparently continuing to try to crack down on media. Much information still coming out, but verification in the old media sense is difficult, and the situation evolving very quickly, as darkness has just fallen in Tehran.

NYT blog is forwarding reports of shooting in Azadi Square. If true, and if there is more, that would certainly change the game. Does the opposition have enough people power? How much force will the government use? Those are tonight’s questions.