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updated 10/24/2011 1:56:31 PM ET 2011-10-24T17:56:31

A U.S. citizen facing charges that he plotted to assassinate the Saudi ambassador to the United States pleaded not guilty Monday.

Manssor Arbabsiar, 56, who holds an Iranian passport, entered the plea in U.S. District Court in New York to a five-count indictment returned last week. Those charges were the same as those contained in an Oct. 11 criminal complaint.

According to the complaint, Arbabsiar has admitted his role in a $1.5 million plot to kill the ambassador at a restaurant by setting off explosives.

President Barack Obama's administration has accused agents of the Iranian government of being involved. The press attache at Iran's mission to the United Nations has called the accusation baseless.

U.S. authorities say they secretly recorded conversations between Arbabsiar and an informant with the Drug Enforcement Administration after Arbabsiar approached an informant in Mexico and asked his knowledge of explosives for a plot to blow up the Saudi embassy in Washington. They said Arbabsiar later offered $1.5 million for the death of the ambassador.

Authorities said Arbabsiar eventually made a $100,000 down payment wired from an overseas account for a plot that would kill the ambassador at his favorite restaurant.

No trial date has been set. U.S. District Judge John F. Keenan set Dec. 21 for Arbabsiar's next court appearance, saying that would give prosecutors sufficient time to turn over evidence and for the defense to prepare a likely challenge over whether the government gave Arbabsiar adequate warning of his legal rights before questioning him.

Arbabsiar's lawyer, Sabrina Shroff, declined to comment after Monday's proceeding, which lasted only several minutes.

Arbabsiar was arrested Sept. 29 at John F. Kennedy International Airport on charges that carry a potential life sentence. He was held without bail.

Copyright 2011 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

Timeline: Assassination plot

Following are some key dates in the alleged plot to assassinate the Saudi ambassador in the United States, as described by court papers filed in New York and by U.S. Justice Department officials at a news conference in Washington.

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