Also see: CIA Foreknowledge of the Mumbai Attacks
http://www.911blogger.com/node/18691 - loose nuke

http://timesofindia.indiatimes.com/india/Is-Headley-an-American-agent-who-turned-rogue/articleshow/5273422.cms
Is Headley an American agent who turned rogue?
TNN 27 November 2009, 01:26am IST

NEW DELHI: It's a plot that could be straight out of the bluff-and-double-bluff worlds created by John le Carre and Frederick Forsyth. Only, it
seems to have played out in real life, to the tragic misfortune of hundreds of innocent people. The tantalising possibility that David Coleman Headley may have been a US undercover agent who turned rogue is vexing many here as American authorities keep the US-based Lashkar jihadi out of the reach of Indian investigators.

To make the tale even more dramatic, Headley may just have provided American intelligence agencies information that prevented a Lashkar attack on Mumbai in September. The theory -- and it's still a theory -- is that Headley was used to infiltrate the Lashkar, but gradually went astray under the influence of the very terrorists he was supposed to be spying upon.