Iranian students from universities in Qazvin shout anti-U.S. and anti-Israel slogans while sitting behind a banner 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)