OFAC is alerting the maritime industry that the Islamic Republic of Iran Shipping Lines (IRISL) has been operating vessels despite having its flags revoked. Because of sanctions against IRISL and deceptive practices, many countries have revoked or refused to issue flags to any vessels in which IRISL or its affiliates have an interest. Officials should thoroughly analyze the documentation provided by IRISL ships to ensure that it is not expired or fraudulent. Assisting IRISL or its blocked affiliates to re-flag their vessels may be a basis for designation under Executive Order 13382, which is aimed at freezing the assets of weapons of mass destruction proliferators and their supporters and isolating them financially. The OFAC notice is available at: http://www.treasury.gov/resource-center/sanctions/OFACEnforcement/ Pages/20120719.aspx.