CNN's Jill Dougherty reports on the IAEA report that shows Iran is capable of building nuclear weapon.
Iran's efforts to develop its nuclear program have been stymied by a raft of challenges from international sanctions and set back by the 2010 Stuxnet cyberattack, two new reports from a Washington nuclear think tank conclude.
Supporters of an Iranian opposition group announced Thursday that they have "exclusive" details on a major top-secret strategic nuclear enrichment site buried deep in a mountain northwest of Tehran, but U.S. government officials and nuclear experts are not convinced.
In defiance of U.N. Security Council resolutions, Iran continues its uranium enrichment activities, according to a report by the International Atomic Energy Agency released Monday.
CNN's Becky Anderson talks to Nobel laureate Shirin Ebadi about Iran's intentions in stepping up its uranium enrichment.
Iran's envoy to the International International Atomic Energy Agency (IAEA) said the window for nuclear negotiations is still open -- even as tensions rise over Iran's decision to defy the world on uranium enrichment.
President Obama says Iran must grant unfettered access to IAEA inspectors.
International officials on Wednesday explored Iran's willingness to enter into negotiations over its nuclear program, and a top-level German negotiator expects the Islamic republic to re-enter talks soon.
International inspectors have made new visits to two of Iran's nuclear facilities, including a research reactor that the U.N.'s watchdog agency has been kept out of for a year, a source familiar with Iran's International Atomic Energy Agency file said Thursday.
Iranian President Mahmoud Ahmadinejad said his country could be proud of two major nuclear accomplishments.
Iran's president will deliver some "good news" this week about the country's first nuclear power plant, a semi-official news agency reported Monday.
Iranian scientists have reached "nuclear weapons breakout capability," according to a new report based on findings of the U.N. nuclear watchdog agency.
Scientists say that Iran has reached the ability to build single nuclear bomb. CNN's Rez Sayah has more.
President Bush rejected several Israeli requests last year for weapons and permission for a potential airstrike inside Iran, the author of an investigative report told CNN.
Iran has 5,000 "running centrifuges" in its main nuclear site at Natanz, according to Iranian news reports quoting a top official.
Iran has increased the number of operating centrifuges at its uranium enrichment plant to 4,000, a top official said Friday, pushing ahead with the nuclear program despite threats of new U.N. sanctions
Iran's deputy foreign minister said Friday that almost 4,000 uranium-enriching centrifuges are now operating at the country's Natanz enrichment facility, the national IRNA news agency reported.
The United States has signed off on a European plan that would offer increased incentives for Iran to suspend its uranium enrichment program, senior State Department officials said Thursday.
Iran has assembled hundreds of advanced machines reflecting a possible intention to speed up uranium enrichment, diplomats have told The Associated Press
Iranian military officers' notes and conversations intercepted by the United States played a significant role in the new U.S. assessment of Iran's nuclear weapons plans, officials told CNN.
Iran has reached its long-sought goal of running 3,000 centrifuges to enrich uranium for its nuclear program, Iranian President Mahmoud Ahmadinejad announced Sunday in a report on state media.
The U.N. nuclear monitor reported notable advances in Iran's uranium enrichment program Wednesday while warning for the first time that its knowledge of the country's nuclear activities was shrinking
A day after Iran announced it had begun production of nuclear fuel on an "industrial level," the head of the country's atomic energy organization said Iran had plans to greatly expand its nuclear program.
Iran's controversial president Mahmoud Ahmadinejad said Sunday his country will make an announcement in April about new nuclear achievements.
International Atomic Energy Agency head Mohammed ElBaradei said Friday he was calling for a timeout regarding the Iranian nuclear issue, hoping that talks on the matter can resume.
Iran has resumed its uranium enrichment program by building a second cascade of centrifuges and injecting gas into the system over the past few weeks despite threats of U.N. sanctions over its nuclear program, Iran's semi-official news agency ISNA reported on Friday.
A team of nuclear inspectors will press Iran this week about President Mahmoud Ahmadinejad's assertion that Iran is now in the process of researching and testing a more powerful uranium-enrichment centrifuge technology known as P-2.
Commercial satellite photos indicate Iran has begun to expand its nuclear fuel plants and has buried one beneath dozens of feet of earth and concrete, a U.S.-based nuclear watchdog group reports.
Iran has begun enriching uranium on a very limited scale and is slowly building up its enrichment activities, according to a confidential International Atomic Energy Agency report that was obtained Monday by CNN.
Russia and Iran reported progress Sunday on a Russian proposal for a joint uranium enrichment program, according to Russian news agencies.
An Iranian official said Wednesday Tehran supports a proposal under which Russia would enrich uranium for Iran, but believes the plan still needs some work, according to a report from the Russian news agency Interfax.
Amid the threat of possible U.N. economic sanctions, Iran announced Friday it is transferring its foreign exchange accounts out of U.S. and European banks, according to the semi-official Fars news agency.
The presidents of Iran and Syria were meeting for talks in Damascus on Thursday -- two regional allies facing prospects of showdowns with the U.N. Security Council.
The U.N. atomic watchdog agency says weapons inspectors have not uncovered evidence to support accusations that Iran has a secret nuclear weapons program.
An Iranian opposition group with sources inside Iran's military is making public a list of the senior military personnel and military units it says are involved in Iran's secret nuclear weapons programs.
Iran continues to produce components used to make highly enriched uranium despite the nation's promise to suspend its nuclear program, according to Western diplomats based in Vienna.