EDITORS' NOTE: Reuters and other foreign media are subject to Iranian restrictions on leaving the office to report, film or take pictures in Tehran.

An Iranian student from a university in Qazvin holds a placard with an anti-Bahrain cartoon during a three day sit-in demonstration outside the Saudi Arabia embassy in Tehran April 22, 2011. The demonstration is held to protest against Saudi Arabia's support of Bahraini leaders during the suppression of Bahrain's recent anti-government protests. REUTERS/Morteza Nikoubazl (IRAN - Tags: CIVIL UNREST POLITICS EDUCATION RELIGION)