EDITORS' NOTE: Reuters and other foreign media are subject to Iranian restrictions on their ability to report, film or take pictures in Tehran. Protesters gesture on a street in Tehran in this undated photo uploaded onto Twitter June 21, 2009. Iranian opposition leader Mirhossein Mousavi urged his supporters on Sunday to continue their protests over a disputed presidential election, in a direct challenge to the leadership of the Islamic Republic. REUTERS/Twitter (IRAN POLITICS ELECTIONS CONFLICT)
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