Scotland Yard has been looking into claims that the SAS had played a role. It conducted a "scoping exercise" to assess the credibility of the information.
The police said in a statement Tuesday that they were given unprecedented access to British special forces records.
The claims, widely reported in the British media, were made by an ex-SAS member identified only as Soldier N.
Diana, Dodi and their driver, Henri Paul, died in a car accident in Paris on August 31, 1997.
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