US, Iran experts dispute nuclear bomb 'breakout' timeline
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A US security institute estimates that Iran could amass material for a nuclear bomb in three months or less while Iranian experts cite a time frame six times longer - a dispute going to the heart of talks between Tehran and global powers.
Differences over how fast Iran could "break out" a nuclear weapon complicate the quest for a deal by late July under which Iran would scale back its atomic energy programme in exchange for a lifting of crippling sanctions. (Reuters)
