U.S. told of Iranian effort to create nuclear warhead

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Recent intelligence shows Iran has been working to produce a missile re-entry vehicle containing a small nuclear warhead for its Shahab missiles and has encountered problems developing a reliable centrifuge system for uranium enrichment, U.S. officials said.

The officials, who discussed the intelligence on the condition of anonymity, said Iran's new nuclear warhead program includes what specialists call the basic "physics package" for fitting a nuclear bomb inside the nose cone of a missile.

The officials provided details on the program after Secretary of State Colin L. Powell disclosed Nov. 17 that Iran was developing delivery systems for nuclear missiles. Iran has since agreed to halt uranium enrichment under pressure from the International Atomic Energy Agency (IAEA) and three European governments, a deal the Bush administration views skeptically.

The warhead is based on an indigenous Iranian design and is not being built from design information supplied by the covert nuclear network headed by Pakistani technician Abdul Qadeer Khan, who has admitted supplying nuclear goods to Libya, Iran and North Korea, the officials said.

"They are moving ahead with a design for a warhead," one official said.

Mr. Powell two weeks ago told reporters traveling with him to Santiago, Chile, that the intelligence shows that Iran is "actively working on [nuclear delivery] systems."

"You don't have a weapon until you put it in something that can deliver a weapon," he said.

Other officials said the intelligence revealed that Iranians belonging to the Atomic Energy Agency of Iran were conducting research and testing on development of a nuclear warhead for a missile. The information came from reliable intelligence sources and was not provided by an Iranian opposition group, they said.

In November, the governments of France, Germany and Britain negotiated an agreement with Iran that calls on Tehran to suspend all uranium enrichment. In exchange, Iran received assurances that it will not be brought before the U.N. Security Council for potential sanctions.

Iran demanded that it be allowed to keep 20 centrifuges for research. The IAEA said it will monitor the machines.