Iran has substantially improved the efficiency of its centrifuges that produce enriched uranium, the International Atomic Energy Agency said on Monday.

Iran has substantially improved the efficiency of its centrifuges that produce enriched uranium, the International Atomic Energy Agency said on Monday.

A C.I.A. deal with a family of Swiss engineers helped end Libya?s bomb program, reveal Iran?s atomic labors and undo Abdul Qadeer Khan?s nuclear black market, officials said.

The court barred barred the disgraced scientist Abdul Qadeer Khan from giving interviews about the illicit nuclear network he once confessed to running, but eased other restrictions.

The court?s action will allow the scientist, Abdul Qadeer Khan, to travel within Pakistan, undertake research work and choose a doctor for medical treatment.

Abdul Qadeer Khan, the architect of Pakistan?s nuclear program, said that his country gave centrifuges to North Korea in a 2000 shipment supervised by the army.

Four years after Abdul Qadeer Khan?s atomic black market operation was declared over, inspectors are wondering who may have received the blueprints for a nuclear weapon found on his computer network.

Four years after Abdul Qadeer Khan?s atomic black market operation was declared over, inspectors are wondering who may have received the blueprints for a nuclear weapon found on his computer network.

Investigators say they have found blueprints for an advanced nuclear weapon on computers belonging to a Pakistani nuclear scientist?s smuggling network.

Investigators say they have found blueprints for an advanced nuclear weapon on computers belonging to a Pakistani nuclear scientist?s smuggling network.