updated 2/14/2008 5:53:13 PM ET 2008-02-14T22:53:13

The U.S. has shared new intelligence with the International Atomic Energy Agency that it claims is evidence Iran was trying to make a nuclear weapon, diplomats said Thursday.

One of the diplomats said Washington also gave the IAEA permission to confront Iran with at least some of the information in an attempt to pry details out of the Islamic republic as part of the U.N. nuclear watchdog's attempts to investigate Iran's suspicious nuclear past.

The diplomats suggested that such moves by the U.S. administration would be a reflection of Washington's' drive to pressure Iran into acknowledging that it had focused part of its nuclear efforts toward developing a weapons program.

The U.S. is leading the push for a third set of U.N. sanctions against Iran. Tehran insists its program is intended only to produce energy and has refused U.N. demands that it suspend its uranium enrichment program — technology that can produce both fuel for nuclear reactors and the fissile material for a bomb.

A recent U.S. intelligence assessment that Iran had a clandestine weapons program but stopped working on it four years ago has hurt Washington's attempts to have the U.N. Security Council impose a third set of sanctions.

Selective sharing with IAEA
While the Americans have previously declassified and then forwarded intelligence to the IAEA to help its investigations, they do so on a selective basis.

Following Israel's bombing of a Syrian site late last year, and media reports citing unidentified U.S. officials as saying the target was a nuclear installation, IAEA chief Mohamed ElBaradei turned in vain to the U.S. in asking for details on what was struck, said a diplomat who — like others — spoke on condition of anonymity in exchange for divulging confidential information.

Over the past two years, the U.S. already has shared material on a laptop computer reportedly smuggled out of Iran. In 2005, U.S. intelligence assessed that information as indicating that Tehran had been working on details of nuclear weapons, including missile trajectories and ideal altitudes for exploding warheads.

After declassification, U.S. intelligence also was forwarded on two other issues: the "Green Salt Project" — a plan the U.S. alleges links diverse components of a nuclear weapons program, including uranium enrichment, high explosives testing and a missile re-entry vehicle — and material in Iran's possession showing how to mold uranium metal into warhead form.

Two of the diplomats said the material forwarded to the IAEA over the past two weeks expanded on the previous information from the Americans, but had no additional details.

Iran undergoes two rounds of sanctions
Iran is already under two sets of U.N. Security Council sanctions for refusing to suspend uranium enrichment, which it started developing during nearly two decades of covert nuclear activity built on illicit purchases and revealed only five years ago.

Since then, IAEA experts have uncovered activities, experiments, and blueprints and materials that point to possible efforts by Iran to create nuclear weapons, even though Tehran insists its nuclear project is peaceful and aimed only at creating a large-scale enrichment facility to make reactor fuel.

Its leaders consistently dismiss allegations that they are interested in enrichment for its other use — creating fissile material suitable for arming warheads.

Instead of heeding Security Council demands to freeze enrichment, Iran has expanded its program. On Wednesday, diplomats told the AP that Iran's new generation of advanced centrifuges have begun processing small quantities of the gas that can be used to make the fissile core of nuclear warheads.

Copyright 2008 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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