Iran nuclear sites were interrupted

Associated press a worker in the vicinity is the reactor of the Bushehr nuclear power plant.

Iran nuclear fuel production facilities were temporarily this month subject to the United Nations nuclear watchdog said, in the latest sign of the difficulties that Tehran is faced in promoting its nuclear work.

Inspectors from the International Atomic Energy Agency believe that short interruption of centrifuges in the Natanz enrichment of uranium website, on November 16 started with the attachment is infected according control systems through the Stuxnet computer worm that was related to diplomats, who informed about the report.

The development, said officials with knowledge of the nuclear program, has problems Iran is already in running and increase the centrifuge cascades at the site in Central Iran tightened.

Tehran's first generation of centrifuges are only 60% of the designed capacity, operation, said this Beamten.Teheran was not yet able, more modern equipment in Natanz, probably because of the difficulties using it faced in obtaining high raw materials.

"This clearly shows that you have technical problems with their machines," said Olli Heinonen, IAEA served August top nuclear inspector.

U.S. officials recently said sanctions makes it more difficult for the Iran equipment its nuclear drive to overview could prevent problems at the Natanz Iran enrich quickly its uranium stock to the levels required for a nuclear bomb.

Still, officials said American Tuesday latest IAEA report of international drive area financial pressure use to enforce Iran in negotiations to its nuclear work reduce should not. They also noted fears that some of its nuclear facilities are hidden Iran, could.

"" It seems like you have to fight,"said a senior U.S. official.""But North Korea is an educational event for the Iran: every time you have faced an error you somehow found a way, to work things out have."

Starting in June, reported Iran computer attacks on its industrial nuclear installations, including Natanz and Bushehr nuclear reactor.

Independent computer engineers have then reported that the Stuxnet worm had developed attack computer operating systems by sophisticated machines - were, and most of the systems affected by the worm in the Iran.Speculation focuses Israel both in the us as the source of the worm on neither country confirmed something denied or.

On Tuesday, the head of Iran denied Atomic Energy Agency, Vice President Ali Akbar Salehi, that his country's nuclear programme significantly by the Stuxnet computer worm had injured."Fortunately the nuclear Stuxnet virus a dead end has faced," he said Iran State-run media.

The IAEA reports Iran produced about enough about 3,100 kg of low enriched uranium in Natanz, two nuclear weapons, if the material processed grade is next in weapons.

Details of Iran temporary interruption of enrichment were included, in a nine page report released Tuesday by the IAEA Director General Yukiya Amano, week in advance of the UN Agency Board of Governors meeting was prepared.

Mr. Amano said the opportunity to resolve key issues about Iran's nuclear program increasingly at risk vergeht.Ein IAEA report on the Syrian alleged nuclear activities as time also Tuesday, the same concern published broadcast.

"Mr. Amano wrote it is"essential"that Iran of the Agency to grant access to important persons, documents and bodies.""In the course of time and the possible deterioration in the availability of some relevant information increase of the urgency of the matter", according to the report.

The IAEA says Iran declined since August 2008 is a collaboration with the Agency says investigation whether committed Hartwig activity in "Activities relating to the development of a nuclear payload for a rocket." "can have continue it beyond 2004" the IAEA report.

Iran says it is meeting its international obligations to cooperate with the IAEA and its nuclear programme is exclusively for peaceful purposes.

Diplomats from Russia, China, France Germany, United Kingdom and the United States have to discuss outstanding issues relating to nuclear programme of the Iran including details on the supply of fuel for medical research reactor of Iran talks with the Iran, medical isotopes produced set no date and location vorgeschlagen.Bisher.

Also on Tuesday, one of the sites, Deir Alzour, before international inspectors could determine whether it in to the Web site to nuclear installations contain the IAEA of Syria's lack of cooperation with the Agency said progress in resolving questions about the alleged undisclosed nuclear activities have investigation activity at four locations verhindert.Im year 2007 bombarded Israeli aircraft.

Syria denies nuclear site included.

A Syrian Atomprogramm.Die IAEA report says "with time, some of the information about the Deir Alzour website further deteriorated or completely lost," agency, Syrian cooperation "critical, resolving"Issues of safeguards implementation"Syria."

Write toDavid Crawford at the david.crawford@wsj.com and Jay Solomon at the jay.solomon@wsj.com

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