London (CNN) -- A newly revealed claim of conspiracy in the death of Princess Diana has royal watchers buzzing once again, nearly 16 years after the woman who would now be a royal grandmother died in a Paris car crash.
But British police seem to be knocking down the claim -- that the British military was involved in the deaths of Diana, her boyfriend and driver in August 1997.
"This is not a re-investigation," London police tersely stressed in a statement that revealed none of what it had been told.
The claim appears to have been sent first to military authorities and then London police by the parents-in-law of a British special forces sniper after his marriage had fallen apart, according to an article on the website of the Sunday People newspaper. It did not offer a source for its reporting.
Sunday People said it had seen a seven-page handwritten letter by the in-laws alleging that the soldier, whom the newspaper did not name, had boasted to his wife that the elite British Special Air Service commando unit was behind the deaths.
The U.K.'s Ministry of Defence told CNN only that "this is for Metropolitan Police to investigate."
Yet the deaths have always been paired with conspiracy theories accusing British and French intelligence services and members of British royalty of orchestrating her death.