Material can be used as component in nuclear weapons; European foreign ministers have warned move has 'grave military implications'

Diplomats tell Wall Street Journal UN agency seeking explanations for radioactive materials found in locations Tehran blocked access to last year

US National Security Council said set to hold urgent meeting on Tehran's nuclear program, as Macron offers to be 'honest broker' in negotiations

Pentagon spokesperson says USS Nimitz will move to Indo-Pacific Command, but declines to discuss assessments of Iranian military threat

American officials say Washington's top priority is to consult with allies on how to proceed on return to 2015 accord

Tzachi Hanegbi, a close ally of Netanyahu, says in the future there 'may be no choice' other than an Israeli strike to prevent a nuclear-armed Islamic Republic

International Atomic Energy Agency says Islamic Republic enriching more uranium at underground site, will install more equipment; Tehran confirms

Yuval Steinitz says Tehran will need 6 months for required enrichment before bomb development; US said Iran could produce enough fissile material in weeks if violations continue

US secretary of state says at current rate Tehran is months away from being able to produce material for weapon, but timeframe could shorten

Hossein Salami says national efforts should be directed toward resilience to sanctions rather than negotiations for their removal

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