The Agent: Did the C.I.A. stop an F.B.I. detective from preventing 9/11? By Lawrence Wright, July 2006

This is a story that is so interesting. "The C.I.A. knew a lot about Khallad and his ties to Al Qaeda. The F.B.I. and the C.I.A. have long quarrelled over bureaucratic turf, and their mandates place them at odds. The ultimate goal of the bureau in gathering intelligence is to gain convictions for crimes; for the agency, intelligence itself is the object. If the agency had responded candidly to Soufan’s requests, it would have revealed its knowledge of an Al Qaeda cell that was already forming inside the United States. But the agency kept this intelligence to itself."