The US says it has broken up a major terror plot in which agents linked to Iran sought to assassinate the Saudi ambassador to Washington.
Two men originally from Iran - one a naturalised US citizen - have been charged with counts of conspiracy, Attorney General Eric Holder said.
The plot was "conceived" in Iran by the Quds force, part of Iran's Revolutionary Guard Corps, he added.
The state department has listed Iran as a "state sponsor" of terror since 1984.
Mr Holder described the $1.5m (£960,000) assassination plot as being "conceived, sponsored and directed by Iran", and said Tehran would be held accountable for its alleged involvement.
'Drug cartel informant'Top Iranian officials were responsible for the plans, Mr Holder said.
Iran has denied involvement with the plot, and the official Islamic Republic News Agency (Irna) called the plot a "propaganda campaign" by the US government against Tehran.
The two men linked to the alleged plot were named as Manssor Arbabsiar, a 56-year-old naturalised US citizen with dual Iranian and US passports, and Gholam Shakuri, based in Iran and said to be a member of Iran's Quds Force.
Mr Arbabsiar, who was arrested in John F Kennedy airport in New York on 29 September, has confessed to his involvement in the alleged plot, Mr Holder said. Mr Shakuri was said to be in Iran.
On 24 May 2011 Mr Arbabsiar made contact with an informant for the US Drug Enforcement Agency, under the impression that he was an operative of a Mexican drugs cartel.
Over a series of meetings, details emerged of a conspiracy that involved members of the Iranian government to pay $1.5m for the assassination of Saudi Ambassador Adel al-Jubeir on US soil.
The plot would have been carried out with the use of explosives, Mr Holder said. But he added that no explosives were ever put in place and the public was not in danger.
Mr Holder said the plans led Mr Arbabsiar, with approval from Mr Shakuri, to wire $100,000 to a US bank account as a downpayment for the assassination.
They have been charged with conspiracy to murder a foreign official, weapons conspiracy, and conspiracy to commit international terrorism charges over alleged plans to kill the Saudi ambassador.
President Barack Obama was informed of the alleged plot in June 2011 and has since been kept up to date with developments.
White House spokesman Tommy Vietor said the president had "directed his administration to provide all necessary support to this investigation".
"The disruption of this plot is a significant achievement by our intelligence and law enforcement agencies, and the President is enormously grateful for their exceptional work," Mr Vietor added.
Mr Holder said the alleged conspiracy amounted to a "flagrant violation of US and international law" and breaches international conventions that protect diplomats from harm.
FBI Director Robert Mueller told reporters: "Though it reads like the pages of a Hollywood script, the impact would have been very real and many lives would have been lost."
The treasury department later announced sanctions against five people - including Mr Arbabsiar and Mr Shakuri - whom it linked to the alleged plot.
Treasury Undersecretary David Cohen said the financial transactions involved "lay bare the risk that banks and other institutions face in doing business with Iran".
Mr Arbabsiar, who is due to appear in court in New York on Tuesday, faces a potential life prison sentence if convicted on all charges, the Department of Justice said.
Criminal charges will be brought in the southern district of New York because the alleged $100,000 downpayment was wired through a bank in the area, officials said.
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BBC News - Iran agents 'planned US terror attacks'
Well, this should end well.
Two men originally from Iran - one a naturalised US citizen - have been charged with counts of conspiracy, Attorney General Eric Holder said.
The plot was "conceived" in Iran by the Quds force, part of Iran's Revolutionary Guard Corps, he added.
The state department has listed Iran as a "state sponsor" of terror since 1984.
Mr Holder described the $1.5m (£960,000) assassination plot as being "conceived, sponsored and directed by Iran", and said Tehran would be held accountable for its alleged involvement.
'Drug cartel informant'Top Iranian officials were responsible for the plans, Mr Holder said.
Iran has denied involvement with the plot, and the official Islamic Republic News Agency (Irna) called the plot a "propaganda campaign" by the US government against Tehran.
The two men linked to the alleged plot were named as Manssor Arbabsiar, a 56-year-old naturalised US citizen with dual Iranian and US passports, and Gholam Shakuri, based in Iran and said to be a member of Iran's Quds Force.
Mr Arbabsiar, who was arrested in John F Kennedy airport in New York on 29 September, has confessed to his involvement in the alleged plot, Mr Holder said. Mr Shakuri was said to be in Iran.
On 24 May 2011 Mr Arbabsiar made contact with an informant for the US Drug Enforcement Agency, under the impression that he was an operative of a Mexican drugs cartel.
Over a series of meetings, details emerged of a conspiracy that involved members of the Iranian government to pay $1.5m for the assassination of Saudi Ambassador Adel al-Jubeir on US soil.
The plot would have been carried out with the use of explosives, Mr Holder said. But he added that no explosives were ever put in place and the public was not in danger.
Mr Holder said the plans led Mr Arbabsiar, with approval from Mr Shakuri, to wire $100,000 to a US bank account as a downpayment for the assassination.
They have been charged with conspiracy to murder a foreign official, weapons conspiracy, and conspiracy to commit international terrorism charges over alleged plans to kill the Saudi ambassador.
President Barack Obama was informed of the alleged plot in June 2011 and has since been kept up to date with developments.
White House spokesman Tommy Vietor said the president had "directed his administration to provide all necessary support to this investigation".
"The disruption of this plot is a significant achievement by our intelligence and law enforcement agencies, and the President is enormously grateful for their exceptional work," Mr Vietor added.
Mr Holder said the alleged conspiracy amounted to a "flagrant violation of US and international law" and breaches international conventions that protect diplomats from harm.
FBI Director Robert Mueller told reporters: "Though it reads like the pages of a Hollywood script, the impact would have been very real and many lives would have been lost."
The treasury department later announced sanctions against five people - including Mr Arbabsiar and Mr Shakuri - whom it linked to the alleged plot.
Treasury Undersecretary David Cohen said the financial transactions involved "lay bare the risk that banks and other institutions face in doing business with Iran".
Mr Arbabsiar, who is due to appear in court in New York on Tuesday, faces a potential life prison sentence if convicted on all charges, the Department of Justice said.
Criminal charges will be brought in the southern district of New York because the alleged $100,000 downpayment was wired through a bank in the area, officials said.
--
BBC News - Iran agents 'planned US terror attacks'
Well, this should end well.
