From Rogue Nuclear Programs, Web of Trails Leads to Pakistan
By DAVID E. SANGER and WILLIAM J. BROAD

he Pakistani leaders who denied for years that scientists at the country's secret A. Q. Khan Research Laboratories were peddling advanced nuclear technology must have been averting their eyes from a most conspicuous piece of evidence: the laboratory's own sales brochure, quietly circulated to aspiring nuclear weapons states and a network of nuclear middlemen around the world.

The cover bears an official-looking seal that says "Government of Pakistan" and a photograph of the father of the Pakistani bomb, Abdul Qadeer Khan. It promotes components that were spinoffs from Pakistan's three-decade-long project to build a nuclear stockpile of enriched uranium, set in a drawing that bears a striking resemblance to a mushroom cloud.

In other nations, such sales would be strictly controlled. But Pakistan has always played by its own rules.

As investigators unravel the mysteries of the North Korean, Iranian and now the Libyan nuclear projects, Pakistan — and those it empowered with knowledge and technology they are now selling on their own — has emerged as the intellectual and trading hub of a loose network of hidden nuclear proliferators.

That network is global, stretching from Germany to Dubai and from China to South Asia, and involves many middlemen and suppliers. But what is striking about a string of recent disclosures, experts say, is how many roads appear ultimately to lead back to the Khan Research Laboratories in Kahuta, where Pakistan's own bomb was developed.