- Associated Press - Tuesday, September 11, 2012

VIENNA — The U.N. atomic agency has received new and significant intelligence over the past month that Iran has moved further toward the ability to build a nuclear weapon, diplomats tell the Associated Press.

They say the intelligence shows that Iran has advanced its work on calculating the destructive power of an atomic warhead through a series of computer models that it ran sometime within the past three years.

The diplomats say the information comes from Israel, the United States and at least two other Western countries and concludes that the work was done sometime within the past three years. The time-frame is significant because if the International Atomic Energy Agency decides that the intelligence is credible, it would strengthen its concerns that Iran has continued weapons work into the recent past — and may be continuing to do so.

Because computer modeling work is normally accompanied by physical tests of the components that go into a nuclear weapons, it would also buttress IAEA fears outlined in detail in November that Tehran is advancing its weapons research on multiple fronts.

“You want to have a theoretical understanding of the working of a nuclear weapon that is then related to the experiments you do on the various components,” said David Albright, whose Washington-based Institute for Science and International Security is a frequent go-to source on Iran for Congress and other U.S. government branches. “The two go hand-in-hand.”

Such computer mock-ups typically assess how high explosives compress fissile warhead material, setting off the chain reaction that results in a nuclear explosion. The yield is normally calculated in kilotons.

Any new evidence of Iranian research into nuclear weapons is likely to strengthen the hand of hawks in Israel who advocate a military strike on Iran. They argue that Tehran is deliberately stalemating international efforts at engagement while continuing its clandestine weapons work.

Iran denies any interest in nuclear weapons and says suspicions that it ever tried to develop them are based on fabricated U.S, Israeli and other intelligence. At the same time, it has blunted IAEA efforts to investigate such claims for more than five years.

It also has scoffed at Western allegations that it is enriching uranium to make the core of nuclear warheads, saying it seeks only to create reactor fuel. But it refuses to accept offers of such fuel from abroad and is now producing material that is easier to turn into weapons-grade uranium than its main, lower-enriched stockpile.

The revelations come as Israeli officials are expressing growing alarm over what they see as continuing Iranian progress toward nuclear arms.

Israeli Prime Minister Benjamin Netanyahu engaged this week in a strident public exchange with the U.S. administration, calling on Sunday for “red lines” to be set for Iran. The calls were rebuffed, and on Tuesday, Netanyahu declared that “those in the international community who refuse to draw a red line on Iran don’t have a moral right to place a red light before Israel.”

Netanyahu said that sanctions were hurting Iran’s economy but not nearly enough to compel it to stop the nuclear program, and said negotiations by the international community with Iran on the issue had failed.

Israel’s position is that airtight sanctions are needed against Iran’s central bank and oil exports. Because Asian nations in particular keep buying Iranian oil the country remains a top OPEC oil exporter, even though there are signs that its revenues are down and, with the currency plummeting, standards of living in Iran have fallen.

The comments from Netanyahu were the latest suggestion that Israel is considering taking military action on its own to at least slow down Iran’s program. That prospect could badly rattle world markets and spark wider war, and is opposed not only in most Western capitals but also among many in Israel’s security and political establishment. But Israeli officials have said that with Iran moving facilities underground its window of opportunity is closing while the world dithers with an inadequate sanctions regime.

Although some of the new information was said to have been supplied by the United States, it appears to run counter to the stated U.S. position that Iran shut down wide-ranging secret research and development of the components of a nuclear weapons program in 2003. At the same time the U.S. fears that Iran continues to move toward the threshold of making such arms by enriching uranium.

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