The ABC has learned that uranium was secretly being enriched at Sydney's Lucas Heights reactor 20 years ago. Enriched uranium is the fuel that runs nuclear power stations and can be used to build nuclear weapons.

U.S. Attorney General Alberto Gonzales said at an anti-terrorism conference in Mamithe that international community must communicate and coordinate efforts to stop terrorists who may be seeking nuclear weapons.

Radio Farda spoke with the United States' permanent representative to Vienna, Gregory Schulte, ahead of meetings of the International Atomic Energy Agency's (IAEA) governing board at which member states were expected to discuss Iran's disputed nuclear program.

Talks between the head of the United Nations nuclear agency and high-ranking Iranian officials to discuss Iran's nuclear program have been canceled.

Tehran has condemned a recent warning by the Group of Eight (G8) industrialized economies that Iran could face more sanctions over its controversial nuclear program.

The chief of the U.N. nuclear agency, Mohamed ElBaradei, and the Italian Foreign Minister Massimo D'Alema are stressing the need for the international community to strengthen the nuclear non-proliferation treaty to avoid nuclear stand-offs such as the one with Iran. Sabina Castelfranco reports from Rome.

As talks on nuclear weapons stalled North Korea fired missiles into waters off its coast Thursday in an apparent test launch.

Indian and U.S. delegates met for a second day Friday to seal a much-touted civilian nuclear deal between the two countries, officials said. The deal has been delayed by disagreements over clauses that India says could limit its nuclear weapons program and, in the process, impinge on its sovereignty.

Iran today again insisted it will not agree to the key demand of Western powers about its controversial nuclear program. Iran's Foreign Ministry spokesman Mohammad Ali Hosseini says Tehran will not suspend uranium enrichment, a process the West fears could be used to make nuclear weapons.

Russia's foreign minister today accused the United States of starting a new arms race with its plans to deploy a missile-defense system in Central Europe. Sergei Lavrov was speaking after a meeting of foreign ministers from the Group of Eight (G8) major industrial nations in Germany.

Iranian nuclear negotiator Ali Larijani said in Tehran today his country will not suspend uranium enrichment. The refusal comes one day ahead of talks between EU foreign-policy chief Javier Solana and Larijani in the Spanish capital, Madrid.

The head of the UN's nuclear guardian has estimated that Iran could build a nuclear weapon within "three to eight years" -- if it chose that path -- and urged both sides in the international standoff with Iran to pursue negotiations.