London police have questioned British secret service agents in an investigation into the August 1997 death of Princess Diana.
Police Commissioner John Stevens said detectives received complete cooperation from the MI5 and MI6 British secret service units but declined to reveal what they said, the Times of London reported Tuesday.
Stevens began investigating at the request of the queen's coroner, who wanted more information about the circumstances of the death of Princess Diana and Dodi Fayed when their car crashed during a media chase in Paris.
The Princess had claimed in a letter that her husband, Prince Charles, planned to kill her, possibly in an auto accident, the newspaper said. There also were allegations that chauffeur Henri Paul, who also was killed, was being paid by British intelligence agents.
Stevens said he will talk to the Prince of Wales and the queen eventually. Stevens, who is about to retire from Metropolitan Police, said he will continue handling the investigation and expects an inquest to be late this year or early in 2006.