Western Governments have been involved in continuing diplomatic efforts to halt any potential programme.
But is the Iranian Government acquiring military components and sensitive technologies from companies in some of the nations that are most concerned about Iran?
Allan Urry investigates whether the UK and its European allies are doing enough to prevent Iran receiving components and technologies from hi-tech companies in the West.
Hear the full story on Radio 4: File On 4 Tuesday 3 July 2007 at 2000 BST, repeated Sunday 8 July at 1700 BST.
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