According to U.S. officials, elements of the Iranian government planned to assassinate Saudi Arabia's ambassador to the United States as well as bomb the Israeli Embassy in Washington D.C. and the Saudi and Israeli Embassies in Argentina, with the help of Los Zetas, a Mexican drug cartel.  The alleged plot was planned by Mansour J. Arbabsiar, an Iranian-American living in the United States, and Gholam Shakuri, an officer in Iran's Quds Force, which is part of the Islamic Revolutionary Guard Corps.  Mr. Arabsiar was arrested in New York on September 29, 2011; Mr. Shakuri remains at large.  Iran has denied the allegations.