Martino, in turn, offered them to Italian journalist Elizabetta Burba. On instructions from her editor at Panorama, Burba offered them to the U.S. Embassy in Rome in October, 2002. 
It is as yet unknown how Italian intelligence came by the documents and why they were not given directly to the U.S. In 2005, Vincent Cannistraro, the former head of counterterrorism operations at the CIA and the intelligence director at the National Security Council under Ronald Reagan, expressed the opinion that the documents had been produced in the United States and funneled through the Italians: "The documents were fabricated by supporters of the policy in the United States. The policy being that you had to invade Iraq in order to get rid of Saddam Hussein ...." 
In an interview published April 7, 2005, Cannistraro was asked by Ian Masters what he would say if it was asserted that the source of the forgery was former National Security Council and State Department consultant Michael Ledeen. (Ledeen had also allegedly been a liaison between the American Intelligence Community and SISMI two decades earlier.) Cannistraro answered by saying: "you'd be very close." 
In an interview on July 26, 2005, Cannistraro's business partner and columnist for the "American Conservative" magazine, former CIA counter terrorism officer Philip Giraldi, confirmed to Scott Horton that the forgeries were produced by "a couple of former CIA officers who are familiar with that part of the world who are associated with a certain well-known neoconservative who has close connections with Italy." When Horton said that must be Ledeen, he confirmed it, and added that the ex-CIA officers, "also had some equity interests, shall we say, with the operation. A lot of these people are in consulting positions, and they get various, shall we say, emoluments in overseas accounts, and that kind of thing." 
In a second interview with Horton, Giraldi elaborated to say that Ledeen and his former CIA friends worked with Ahmad Chalabi and the Iraqi National Congress. "These people did it probably for a couple of reasons, but one of the reasons was that these people were involved, through the neoconservatives, with the Iraqi National Congress and Chalabi and had a financial interest in cranking up the pressure against Saddam Hussein and potentially going to war with him."
Now Justin Raimondo writes:
"Previous versions of the report were redacted and had all the names removed, though it was possible to guess who was involved. This version names Michael Ledeen as the conduit for the report and indicates that former CIA officers Duane Clarridge and Alan Wolf were the principal forgers. All three had business interests with Chalabi."
Alan Wolf died about a year and a half ago of cancer. He served as chief of the CIA's Near East Division as well as the European Division, and was also CIA chief of station in Rome after Clarridge. According to my source, "he and Clarridge and Ledeen were all very close and also close to Chalabi." The former CIA officer says Wolf "was Clarridge's Agency godfather. Significantly, both Clarridge and Wolf also spent considerable time in the Africa division, so they both had the Africa and Rome connection and both were close to Ledeen, closing the loop."
(Ledeen and Clarridge links added)
This supports recent reports that Fitzgerald's investigation has widened considerably. UPDATE 10/24/05: UPI confirmation of story.