An article dated 6/15/08 in the Chicago Tribune, Section 1, page 11 was titled "Smugglers reportedly had design for modern warhead".
The article described how in 2006 some computers that were owned by smugglers were found to contain designs for nuclear weapons to fit into a missile body. The design is of an advanced nature. It is unknown if any of this data was ever delivered to anyone.
The overall point is one that I have been making and will continue to hammer on: Time is NOT on our side. It is only a matter of time before a terrorist organization obtains and deploys an effective WMD.