An Italian prosecutor has issued arrest warrants for three additional suspects on charges of playing a role in the CIA kidnapping of a radical Muslim cleric in 2003.

The action Friday brings to 22 the number of suspected CIA operatives alleged to be involved in the kidnapping of Hassan Mustafa Osama Nasr, also known as Abu Omar, from a Milan street.

Italian courts earlier this year issued warrants for 19 other U.S. citizens in connection with the kidnapping. The cleric was later transferred to Egypt, where he claims he was tortured. Italian news reports have said the cleric is wanted in Italy on terrorism charges.

The case has increased tensions between Italy and the United States. In July, Italian Prime Minister Silvio Berlusconi summoned the U.S. ambassador and demanded that the United States fully respect his country's sovereignty.

American and Egyptian officials have declined to comment on the Italian charges.

Some information for this report provided by AFP and AP.