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Iran has now produced roughly enough nuclear material to make, with added purification, a single atom bomb, according to nuclear experts analyzing the latest report from global atomic inspectors.

The figures detailing Iran's progress were contained in a routine update on Wednesday from the International Atomic Energy Agency, which has been conducting inspections of the country's main nuclear plant at Natanz. The report concluded that as of early this month, Iran had made 630 kilograms, or about 1,390 pounds, of low-enriched uranium.

Several experts said that was enough for a bomb, but they cautioned that the milestone was mostly symbolic, because Iran would have to take additional steps. Not only would it have to breach its international agreements and kick out the inspectors, but it would also have to further purify the fuel and put it into a warhead design — a technical advance that Western experts are unsure Iran has yet achieved.

"They clearly have enough material for a bomb," said Richard Garwin, a top nuclear physicist who helped invent the hydrogen bomb and has advised Washington for decades. "They know how to do the enrichment. Whether they know how to design a bomb, well, that's another matter."

Iran insists that it wants only to fuel reactors for nuclear power. But many Western nations, led by the United States, suspect that its real goal is to gain the ability to make nuclear weapons.

While some Iranian officials have threatened to bar inspectors in the past, the country has made no such moves, and many experts inside the Bush administration and the IAEA believe it will avoid the risk of attempting "nuclear breakout" until it possessed a larger uranium supply.

Even so, for President-elect Barack Obama, the report underscores the magnitude of the problem that he will inherit Jan. 20: an Iranian nuclear program that has not only solved many technical problems of uranium enrichment, but that can also now credibly claim to possess enough material to make a weapon if negotiations with Europe and the United States break down.

American intelligence agencies have said Iran could make a bomb between 2009 and 2015. A national intelligence estimate made public late last year concluded that around the end of 2003, after long effort, Iran had halted work on an actual weapon. But enriching uranium, and obtaining enough material to build a weapon, is considered the most difficult part of the process.

Siegfried Hecker of Stanford University and a former director of the Los Alamos weapons laboratory said the growing size of the Iranian stockpile "underscored that they are marching down the path to developing the nuclear weapons option."

In the report to its board, the atomic agency said Iran's main enrichment plant was now feeding uranium into about 3,800 centrifuges — machines that spin incredibly fast to enrich the element into nuclear fuel. That count is the same as in the agency's last quarterly report, in September. Iran began installing the centrifuges in early 2007. But the new report's total of 630 kilograms — an increase of about 150 — shows that Iran has been making progress in accumulating material to make nuclear fuel.

That uranium has been enriched to the low levels needed to fuel a nuclear reactor. To further purify it to the highly enriched state needed to fuel a nuclear warhead, Iran would have to reconfigure its centrifuges and do a couple months of additional processing, nuclear experts said.

"They have a weapon's worth," Thomas Cochran, a senior scientist in the nuclear program of the Natural Resources Defense Council, a private group in Washington that tracks atomic arsenals, said in an interview.

He said the amount was suitable for a relatively advanced implosion-type weapon like the one dropped on Nagasaki. Its core, he added, would be about the size of a grapefruit. He said a cruder design would require about twice as much weapon-grade fuel.

"It's a virtual milestone," Cochran said of Iran's stockpile. It is not an imminent threat, he added, because the further technical work to make fuel for a bomb would tip off inspectors, the United States and other powers about "where they're going."

The agency's report made no mention of the possible military implications of the size of Iran's stockpile. And some experts said the milestone was still months away. In an analysis of the IAEA report, the Institute for Science and International Security, a private group in Washington, estimated that Iran had not yet reached the mark but would "within a few months." It added that other analysts estimated it might take as much as a year.

Whatever the exact date, it added, "Iran is progressing" toward the ability to quickly make enough weapon-grade uranium for a warhead.

Peter Zimmerman, a physicist and former United States government arms scientist, cautioned that the Iranian stockpile fell slightly short of what international officials conservatively estimate as the minimum threatening amount of nuclear fuel. "They're very close," he said of the Iranians in an interview. "If it isn't tomorrow, it's soon," probably a matter of months.

In its report, the IAEA, which is based in Vienna, said Iran was working hard to roughly double its number of operating centrifuges.

A senior European diplomat close to the agency said Iran might have 6,000 centrifuges enriching uranium by the end of the year. The report also said Iran had said it intended to start installing another group of 3,000 centrifuges early next year.

The atomic energy agency said Iran was continuing to evade questions about its suspected work on nuclear warheads. In a separate report released Wednesday, the agency said, as expected, that it had found ambiguous traces of uranium at a suspected Syrian reactor site bombed by Israel last year.

"While it cannot be excluded that the building in question was intended for non-nuclear use," the report said, the building's features "along with the connectivity of the site to adequate pumping capacity of cooling water, are similar to what may be found in connection with a reactor site." Syria has said the uranium came from Israeli bombs.

yahoo news

ISLAMABAD, Pakistan – The U.S. military apparently struck at Islamic militants outside Pakistan's lawless tribal belt for the first time Wednesday, firing a missile that killed six suspected insurgents taking refuge away from the conflict zone along the Afghan border.

The government denounced the attack as yet another "grave provocation" amid a series of U.S. military operations in the country that have enflamed widespread anger among ordinary Pakistanis.

The harsh words were a sharp contrast to comments Tuesday by U.S. and NATO officials who reported increased cooperation from Pakistan in the fight against militant groups. Tens of thousands of U.S. and NATO troops are stationed in neighboring Afghanistan.

"It looks like the Americans are not listening, but this is such a great provocation that it will bring a strong response from the government of Pakistan that will dissuade them," presidential spokesman Farhatullah Babar said of the latest missile strike.

He declined to say what the response would be.

The government, which relies heavily on U.S. financial aid, has not gone beyond criticizing raids. Some experts question whether the leadership secretly condones the attacks while speaking out publicly against them, but the government denies that.

Although many militants have died in the U.S. strikes, Pakistani leaders have repeatedly called for a halt, saying the raids also often kill civilians and undercut public support for their own war against the extremists.

The United States has staged some 20 missile strikes and at least one commando assault inside Pakistan since August, a barrage seen as a sign of Washington's frustration with the inability of its nuclear-armed ally to curb militants blamed for rising attacks in Afghanistan.

All the previous attacks had come in North and South Waziristan, semiautonomous tribal areas bordering Afghanistan. But Wednesday's attack blew up a house in Indi Khel, a village in the Bannu district about 30 miles from the Afghan border and beyond the tribal region.

The identities of those killed were still being investigated, but a senior military officer said "the Americans are very confident" an al-Qaida member identified as Abdullah Azam al-Saudi was among the victims. He did not elaborate.

Earlier, two Pakistani intelligence officials said their agents reported that militants from Central Asia were believed to be among the six dead. They also insisted on anonymity.

All the officials spoke on condition of anonymity because they were not authorized to release the information.

Villagers denied any militants were among the dead, but they declined to discuss the identity of the victims. "Go!" one man shouted at a cameraman who pressed for details while shooting footage obtained by AP Television News.

Adnan Khan Wazir, a Bannu lawmaker, also insisted that only civilians died.

While Bannu is inland from the frontier tribal areas, it is still a dangerous place, and it falls under the control of the regional government — making the attack specially sensitive.

A large Islamist political party threatened to block two major Pakistani roads used to truck supplies to U.S. and NATO troops in Afghanistan unless the cross-border attacks stop.

"If these missiles attacks continue, then we will ask the people to create hurdles in the way of supplies for NATO," said Qazi Hussain Ahmed, chief of Jamaat-e-Islami, which has shown it can mobilize thousands of supporters at short notice.

The supply lines have never been blocked by protests, but militants and criminals often attack trucks traveling them.

The U.S. rarely confirms or denies involvement in strikes inside Pakistan, which are believed to be carried out mainly by unmanned CIA drones flown from across the border in Afghanistan.

Last week, CIA chief Michael Hayden claimed pressure on militants in the tribal region had put al-Qaida "off-balance."

Pakistani President Asif Ali Zardari has little leverage to force the U.S. to stop the attacks, analysts say. Pakistan receives millions in U.S. military and development aid each year and is about to receive an emergency loan from the International Monetary Fund to bolster the economy.

Some analysts have speculated the government has a secret agreement with Washington that allows the attacks on condition that U.S. officials do not admit to them. Zardari and other Pakistani officials strongly deny that.

In a sign of the complex relations between the two countries, U.S. and NATO military officials have praised what they say is improved day-to-day Pakistani cooperation in squeezing militants along the border.

American officials said Tuesday that troops in Afghanistan coordinated with Pakistanis over the weekend to allow artillery shelling of insurgents who were firing rockets across the border. Pakistan's official statement on the matter referred only to militant activity in Afghanistan.

Over the past month, NATO and Pakistan also have cooperated in Operation Lion Heart, a series of complementary offensives involving Pakistani army and paramilitary troops on one side of the border and NATO forces on the other, said Col. John Spiszer, U.S. commander in northeast Afghanistan.

American officials have also praised a Pakistani offensive in the Bajur tribal area that has the government says has killed 1,600 militants in the past three months. Pakistani officials also are trying to persuade tribes to turn against the militants.