In February 2015, in a high-profile press conference in the National Press Building, Jafarzadeh revealed that Iran has a hidden site, known as Lavizan-3, in a military complex in Tehran, where Iran has worked on research and development of advanced centrifuges, including IR-2m, and secretly enriched uranium in violation of the Joint Plan of Action. Members of Congress asked Secretary John Kerry about Lavizan-3, which he promised to follow up, but there are no follow up reports in the media, suggesting that the United States or the IAEA has acted on this.