Showdown today?

The Guardian's frequently-updated post indicates that protests in Tehran are going ahead despite Khamenei's threats, and that the Basîj and riot police are out in force. Unconfirmed reports of some violent clashes. Keep checking Sullivan and Totten and NIAC.

Update (6:36 Oregon time): Reports of gunfire, widespread street fighting, at least one explosion, and chants of "Death to Khamenei". Looks like this is it.....

(The usual link roundup will be later today.)