Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. US Warns Iran on Use of More Advanced Centrifuges Steve Herman WHITE HOUSE - Iran is marking the 40th anniversary of the takeover of the U.S. Embassy in Tehran with an announcement that it is speeding up uranium processing. "We see this as a continuation of nuclear blackmail," a senior U.S. official remarked after Iran's nuclear chief claimed the country is now operating dozens of advanced centrifuges--a move that further goes against the 2015 agreement the country signed with a group of world powers. The announcement, according to the U.S. official, is an attempt by Tehran to get the worried European signatories of the nuclear deal known as the Joint Comprehensive Plan of Agreement to make concessions to Iran. U.S. President Donald Trump, asked later in the day by VOA what should be done about the new, advanced centrifuges, replied: "We're looking into that. We'll see." Ali Akbar Salehi, head of Iran's Atomic Energy Organization, told state television that Iran is operating the IR-6 centrifuges, which allow the processing of uranium much faster than the IR-1 centrifuges Iran was allowed to use under the JCPOA. Salehi also said Iran is working on the development of even faster centrifuges called the IR-9, which he claimed will work 50 times faster than the IR-1. This is "a big step in the wrong direction," according to a senior administration official, who added, "We call on nations to condemn Iran's escalatory steps." The U.S. Treasury Department on Monday rolled out new sanctions against Tehran, adding to the more than 1,000 already imposed on Iran's oil exports, its banks, financial transactions and the military leadership of the Islamic Republic. Among those targeted by the new sanctions are the heads of the armed forces general staff and the Iranian judiciary, as well as the son and the chief of staff of Ayatollah Ali Khameini--Iran's supreme leader. "These individuals are linked to a wide range of malign behaviors by the regime, including bombings of the U.S. Marine barracks in Beirut in 1983 and the Argentine Israelite Mutual Association in 1994, as well as torture, extrajudicial killings and repression of civilians," said Treasury Secretary Steven Mnuchin in a statement. "This action further constricts the supreme leader's ability to execute his agenda of terror and oppression." .