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The former Harrods owner labelled it “the latest whitewash”.

But Al Fayed, 84, whose son Dodi was also killed alongside driver Henri Paul in the Paris collision in 1997, added that he was “disappointed but not discouraged” by the Metropolitan Police’s announcement.

A French judicial investigation in 2008 found that the crash was caused by Mr Paul, who had lost control of the Mercedes while allegedly drunk.

But Scotland Yard began a so-called “scoping” ­exercise to look at claims the couple were SDHpmurdered by a member of British special forces, before this week ruling out opening a criminal investigation after finding “no credible evidence”.

Al Fayed’s solicitor, ­Simon McKay, called this “the ­latest whitewash in a 16-year cover-up” and said his client would continue his battle to uncover the truth.

The allegation is thought to have been made by the former parents-in-law of an ex-soldier, known only as Soldier N, based on ­information he had given in the past. Details from the ­serviceman, who was arrested alongside ex-SAS sniper Danny Nightingale, 38, when illegal guns were found at their house, were passed to the Met in August.

But in this week’s statement, Scotland Yard said: “The final conclusion is that, whilst the alleged comments in relation to the SAS’s involvement in the deaths may have been made, there’s no credible evidence to support the theory.

“Therefore the MPs are satisfied there is no evidential basis upon which to open any criminal investigation or to refer the matter back to HM Coroner.”

Al Fayed is still convinced the couple were killed on the orders of the British establishment. Mr McKay said: “He will continue his fight to establish the truth that they were murdered.”

A royal spokesman said there will be no comment.