Nuclear Weapon | featured news

U.S. Secretary of State Hillary Rodham Clinton has told an international conference that Iran has left the world little choice but to take harsher action to contain its nuclear program.

Ahmadinejad says first batch of higher enriched uranium produced: Iran now "a nuclear state."

Iran is experiencing surprising setbacks in its efforts to enrich uranium, according to new assessments that suggest equipment failures could undermine its nuclear ambitions.

Iran said it has begun enriching some of its low-grade uranium for use in a medical-research reactor, brushing off fresh international threats of economic sanctions.

Mahmoud Ahmadinejad tells his atomic energy chief to boost uranium enrichment from 3.5% to 20% as talks over a nuclear-fuel exchange sputter.

Iran announced the test-firing of a powerful rocket loaded with several live animals into space and unveiled a handful of other space technologies Wednesday, ahead of a nationalist holiday and amid heightened international concerns about Tehran's nuclear research and missile programs.

Group is determined to attack U.S. with chemical, biological or even nuclear weapons, report says.

South Korea's defense chief called Wednesday for a pre-emptive strike on North Korea if there is a clear indication the country is preparing a nuclear attack....

A nuclear physics professor at Tehran University was killed Tuesday by a bomb-rigged motorcycle parked outside his home in Iran's capital, state media reported.

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South Korea and the U.S. rejected North Korea's proposal to start peace talks to formally end the Korean War, with Seoul saying Tuesday that can happen only after the North rejoins disarmament talks and reports progress in denuclearization.