London ? The man who claims Princess Diana and his son were killed in a wide-ranging conspiracy led by Britain’s royal family said Monday that dark forces within the country’s establishment would not accept a marriage between a princess and a Muslim.

Mohamed Al Fayed testified Monday at a coroner’s inquest that the cast of conspirators involved in the 1997 deaths of Diana and Dodi Fayed included Prince Philip, Prince Charles, former Prime Minister Tony Blair and Diana’s sister, Sarah McCorquodale.

He also accused as being part of the alleged plot and cover-up Diana’s brother-in-law Robert Fellowes; two former chiefs of London police; driver Henri Paul; the U.S. Central Intelligence Agency; Diana’s attorney, the late Lord Mishcon; two French toxicologists; members of the French medical service; and three bodyguards he once employed.

Lengthy investigations by French and British police concluded that the Aug. 31, 1997 crash was an accident, and that driver Henri Paul was drunk and speeding.

Al Fayed said he had been thwarted in attempts to prove his theory that the deaths were actually part of a plot led by Prince Philip.

“How can you want me to get the proof?” Al Fayed said. “I am facing a steel wall of the security service, Official Secrets Act. How can you tell me?”

Asked if Queen Elizabeth II was in on the plot, he said: “I do not think the queen is important in that.”

Charles’ interest, Al Fayed claimed, was to get Diana out of the way so that he could marry Camilla Parker Bowles. “They finished her, they murdered her and now he is happy. He married his crocodile wife and he is happy with that,” he said.

Those who disagreed with Al Fayed were dismissed by him as either conspirators or liars.

Richard Horwell, representing the Metropolitan Police, ridiculed key parts of Al Fayed’s theory – that Diana was pregnant, that she and Dodi Fayed were victims of a complex conspiracy and that James Andanson, a paparazzi photographer, was allegedly dispatched as the assassin.

“Do you ever pay any attention whatsoever to the evidence, Mr. Al Fayed?” Horwell said.

Horwell asked why, if the conspirators couldn’t stand a princess marrying a Muslim, Diana had not been killed during her relationship of at least 18 months with Pakistani heart surgeon Hasnat Khan.

Though several witnesses have described Diana’s relationship with Khan as intense, Al Fayed dismissed it as “nothing serious.”

Horwell attacked Al Fayed’s account of a telephone conversation with the princess and his son less than two hours before the crash.

That would have been the first chance for the conspirators to learn, according to Al Fayed, that his son and Diana were getting engaged and that Diana was pregnant, Horwell said.

Al Fayed asked what was Horwell’s point.

“It is important, Mr. Al Fayed, because this extraordinarily elaborate conspiracy has but minutes to be formed and to be put into operation,” Horwell said.

Last week, Al Fayed’s security chief, John Macnamara, testified that he had no evidence implicating Prince Philip, or that the British ambassador in Paris ordered her body embalmed to cover up her pregnancy.