In Italy, Anger at U.S. Tactics Colors Spy Case - New York Times

In Italy, Anger at U.S. Tactics Colors Spy Case - New York Times:

"European counterterrorism officials have pursued a policy of building criminal cases against terrorism suspects through surveillance, wire-taps, detective work and the criminal justice system. The United States, however, has frequently used other means since Sept. 11, 2001, including renditions - abducting terror suspects from foreign countries and transporting them for questioning to third countries, some of which are known to use torture.

Those two approaches seem to have collided in the case of an Egyptian cleric, Hassan Mustafa Osama Nasr, or Abu Omar, who led a militant mosque in Milan.
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When the Italians began investigating, they said, they were startled to find evidence that some of the C.I.A. officers who had been helping them investigate Mr. Nasr were involved in his abduction.

'We do feel quite betrayed that this operation was carried out in our city,' a senior Italian investigator said. 'We supplied them information about Abu Omar, and then they used that information against us, undermining an entire operation against his terrorist network.'"