8 November 2011 Updated at 19:15 ET
UN nuclear agency IAEA: Iran 'studying nuclear weapons'
Russia helped Iran build its Bushehr nuclear power plant
Iran nuclear crisis
Q&A: Iran sanctions
Case against Iran strengthened
White House not on war path
Fuelling Bushehr
The UN's nuclear watchdog says it has information indicating Iran has carried out tests "relevant to the development of a nuclear explosive device".
link-
http://www.bbc.co.uk/news/world-middle-east-15643460