Police are examining new information which alleges that Princess Diana and Dodi Fayed were murdered by a member of the British military.
Scotland Yard said it is “scoping” the information and “assessing its relevance and credibility”.
The claims were passed to the Metropolitan Police by the Royal Military Police (RMP), which was told of them by the former parents-in-law of a former soldier based on information that the ex-soldier had talked about in the past, according to a military source.
A letter given to the RMP is said to allege that the SAS was “behind Princess Diana’s death” and to also refer to the princess’s “secret diary”, in which she allegedly made certain allegations.
Police said they are not prepared to discuss the matter further, while a royal spokeswoman said there will be no comment on the matter from the Duke of Cambridge or Prince Harry.
Diana, Dodi and their chauffeur Henri Paul died on August 31 1997.