The latest on Iran's quest for nuclear weapons....

And the world just wants to go on talking with the Iranians....

Iran has resumed work on constructing highly sophisticated equipment that nuclear experts say is primarily used for building atomic weapons, according to the latest intelligence reports received by Western diplomats.

The work is aimed at developing the blueprint provided by Dr AQ Khan, the "father" of Pakistan's nuclear bomb, who sold Iran details of how to build atom bombs in the early 1990s.

Iran's Revolutionary Guard, which has overall responsibility for the country's nuclear programme, has set up several civilian companies to work on the programme whose activities are being deliberately concealed from the United Nations nuclear inspection teams.

The companies, based on the outskirts of Tehran, are working on constructing components for the advanced P2 gas centrifuge, which can enrich uranium to weapons grade two to three times faster than conventional P1 centrifuges.