The Americans were accused of kidnapping Osama Moustafa Hassan Nasr, also known as Abu Omar, on Feb. 17, 2003, in Milan, then transferring him to U.S. bases in Italy and Germany. He was then moved to Egypt, where he says he was tortured. He was released after four years in prison without being charged.

The trial is the first by any government over the CIA's extraordinary rendition program, which transferred suspects overseas for interrogation. Human rights advocates charge that renditions were the CIA's way to outsource the torture of prisoners to countries where it is permitted.

Italy's government has denied involvement.

Among the Americans acquitted was Jeffrey Castelli, a former Rome CIA station chief, who prosecutors had alleged coordinated the abduction. The two other acquitted Americans were also assigned to the U.S. Embassy in the Italian capital and thus were covered by broad diplomatic immunity.