From Rogue Nuclear Programs, Web of Trails Leads to Pakistan:
"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."

In 2002 the United States was surprised to discover how North Korea had turned to the Khan laboratory for an alternative way to manufacture nuclear fuel, after the reactors and reprocessing facilities it had relied on for years were "frozen" under a now shattered agreement with the Clinton administration. Last year, international inspectors and Western intelligence agencies were surprised again, this time by the central role Pakistan played in the initial technology that enabled Iran to pursue a secret uranium enrichment program for 18 years.

The sources of Libya's enrichment program are still under investigation, but those who have had an early glance say they see "interconnections" with both Pakistan and Iran's programs — and Libyan financial support for the Pakistani program that stretches back three decades.…

http://www.nytimes.com/2004/01/04/international/04NUKE.html?pagewanted=all&position=