From the New York Times:

Iraqi investigators who are trying to find the kidnappers of the Italian journalist Giuliana Sgrena say their work has been stymied by a lack of cooperation from the Italian intelligence services that won her release exactly a month after she was abducted on Feb. 4.
The Iraqi investigators say they conducted as many as half a dozen raids in a northwest Baghdad neighborhood where they think Ms. Sgrena, 56, a reporter for the far-left Rome daily Il Manifesto, was being held. But the kidnappers slipped through their fingers, and she was released after the abductors negotiated with Italian intelligence agents. One of those agents was killed when American troops fired on the car taking Ms. Sgrena to freedom.
Even after her release, Italian officials have refused to share information with the Iraqis, said Col. Jabbar Anwar, chief of the major crimes unit in the sector of Baghdad that includes Gazalea, the neighborhood where she was thought to be held.
The ring that committed the kidnapping was a profit-making organization that is likely to repeat the crime, he said. “They made a big mistake when they let the criminals go, especially if they gave them money,” Colonel Jabbar said, referring to reports in the Italian news media and denied by the Italian government that a ransom as large as $8 million was paid.