It is early yet, but @persiankiwi, the indispensable if unconfirmed source in Iran, appears to be suggesting that Mir Hossein Mousavi plans to respond to Supreme Leader Ayatollah Ali Khamenei.
Mousavi is calling for a rally on Saturday and, according to persiankiwi, he will attend.
It also appears that Khamenei was serious about cracking down on dissenters.
unconfirmed reports – Revolutionary Guard has been mobilised to secure Tehran – #Iranelection