Iran has expanded the tunnels it uses to hide a major part of its nuclear weapons programme to a network covering a large area of south-eastern Tehran, an Iranian exile who opposes that nation’s Islamic government said.

The United Nations nuclear watchdog is scrambling for solutions to the Iran crisis as Tehran prepares to break agency seals today and resume further work at one of its atomic facilities.

THE UN nuclear watchdog agency held an emergency meeting yesterday to assess Iran's resumption of uranium conversion.

Iran has manufactured about 4,000 centrifuges capable of enriching uranium to weapons grade, an exiled Iranian dissident who helped uncover nearly two decades of covert nuclear activity in 2002 said today.