John Stillwell, Associated Press
Salman Rushdie shows his knighthood medal Wednesday in London.

Author Salman Rushdie slipped into Buckingham Palace on Wednesday to receive a knighthood from Queen Elizabeth II that had angered many parts of the Muslim world when the honor was announced last year.

In a break with normal procedure, the palace did not announce ahead of time that Rushdie would be honored Wednesday.

A spokeswoman for the queen, who asked not to be identified because of the monarch's policy, said Rushdie was not listed among those to be honored because he was a late addition to the investiture. She refused to comment on whether his name had been withheld because of security concerns.

Security has been a major concern for Rushdie since 1989, when Iranian leader Ayatollah Ruhollah Khomeini pronounced a death sentence on the author, accusing him of blasphemy against the Muslim world in his novel "The Satanic Verses." The edict forced Rushdie to live underground with constant protection for many years until it was finally withdrawn in 1998.

Rushdie, dressed in a formal morning suit and obviously pleased with the honor, told reporters after the ceremony that he was not sorry about writing "The Satanic Verses."

"I really have no regrets about any of my work," he said when asked about his most inflammatory novel.