On questions about nuclear centrifuges, this was unambiguously the A-Team of the intelligence community, many experts say.

British spies originally disagreed with the Bush administration charge that aluminum tubes bought by Iraq were intended for use as nuclear centrifuges, the Butler report said.

The New York Times has reported that the Stuxnet computer worm appears to have wiped out roughly a fifth of Iran's nuclear centrifuges, and has delayed the Iranian's nuclear weapons capability.

A particular issue of focus has been the attempted procurement by Iraq of high strength aluminum tubes, and the question of whether these tubes, if acquired, could be used for the manufacture of nuclear centrifuges.

Several nuclear scientists have been mysteriously assassinated and, late last year, a sophisticated computer virus succeeded in shutting down roughly a fifth of Iran's nuclear centrifuges.

She participated in multiple exercises and operations and achieved historic distinction when she tracked and assisted in the interception of a merchant ship loaded with nuclear centrifuges bound for Libya.

There was the running dispute last winter with the International Atomic Energy Agency over the question of whether specialized tubes were intended for Iraqi nuclear centrifuges.

Iran's large uranium-enrichment complex at Natanz, including an unfinished hall for 50,000 nuclear centrifuges that sits empty more than 50 feet underground, could be destroyed with earth-penetrating conventional bombs.

Iran will resume manufacturing equipment for its nuclear centrifuges, and North Korean negotiators told their American counterparts of the threat to test a nuclear weapon.

European nations said they had received a diplomatic note from Iran saying it would resume manufacturing equipment for its nuclear centrifuges, but not resuming uranium enrichment.