EDITORS' NOTE: Reuters and other foreign media are subject to Iranian restrictions on their ability to report, film or take pictures in Tehran. An injured man is assisted 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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