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(Reuters) - EDITORS' NOTE: Reuters and other foreign media are subject to Iranian restrictions on their ability to film or take pictures in Tehran.

Iranian opposition supporters beat police forces during clashes in central Tehran in this December 27, 2009 file photo. Internet messages have been circulating about possible rallies on February 11, 2010, when Iran marks the 31st anniversary of the Islamic revolution. But the climate in the Islamic Republic is much harder than before last year's post-election protests. To match feature IRAN/REVOLUTION-INTERNET REUTERS/Stringer/Files (IRAN - Tags: POLITICS SCI TECH CIVIL UNREST)