LONDON (AFP) -- A long-awaited report into Princess Diana's death in a Paris car crash will confirm a French probe that it was an accident and refute theories of a plot by British intelligence.

The report by Lord John Stevens, the former Metropolitan Police commissioner, has concluded that Diana died in a traffic accident after her driver lost control of the car while drunk at the wheel, the leaks said Sunday.

Princess Diana, 36, Dodi Fayed, 42, and their chauffeur Henri Paul, 41, were killed in a car crash in a Paris underpass in the early hours of August 31, 1997.

A two-year investigation in France blamed Paul for losing control of the black Mercedes because he was driving too fast while high on drink and prescription drugs.

First to break the report's conclusions, the BBC said Friday that blood samples taken from Paul just after his death were indeed his and show him accurately to have been three times over the French drunk-driving limit.

A source close to the French authorities told the BBC that the DNA tests were done in France within the last year, adding that DNA taken from Paul's blood samples matched that of his parents.

It said the information serves to refute conspiracy theories alleging that Paul's blood samples were switched in order to show that he was drunk.