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LONDON, England -- Princes William and Harry are "deeply upset" at the behavior of the paparazzi as their mother Princess Diana lay dying, British media reports say.
The brothers have already been briefed on the outcome of Lord Stevens' police investigation into the death of Diana, Princess of Wales, which was being published Thursday.
The official police inquiry into Princess Diana's death is expected to rule out foul play and seek to bury conspiracy theories of a murder plot that have resonated for almost a decade.
After a three-year inquiry, security experts believe that Britain's former Scotland Yard chief Sir John Stevens will rule that she died in a Paris car crash because chauffeur Henri Paul was drunk and driving too fast. (Full story)
William, 24, and 22-year-old Harry were described as "distressed and angry" after learning in full of the photographers' behavior after the 1997 crash in a Paris underpass.
French paparazzi took pictures of their mother as she lay fatally wounded in the wrecked Mercedes at the scene as emergency workers battled to save her.
A source told the UK's Press Association: "They feel very strongly about it and it has upset them."
The princes' distress has been heightened by the attention their girlfriends Kate Middleton and Chelsy Davy have faced in recent times.
Diana, 36, and 42-year-old Dodi Fayed, were killed when their Mercedes crashed in the Pont de l'Alma tunnel in the early hours of August 31, 1997.
The couple had been pursued by paparazzi photographers after leaving the Ritz Hotel for Fayed's apartment.
Lord Stevens is set to rule out various conspiracy theories surrounding the crash, including Dodi's father Mohamed al Fayed's claims that they were murdered as part of a plot by the British establishment. It is predicted he will criticize the paparazzi.
In 1999, the French investigation formally cleared nine photographers and a press motorcyclist of manslaughter charges.
In February this year, three photographers were convicted of breaching France's privacy laws for taking pictures of Diana and Fayed on the night they died.
A symbolic fine of one euro (70p) was imposed on Jacques Langevin, Fabrice Chassery and Christian Martinez at the end of the long-running legal case.
Fayed's father insisted he would not accept what he called the "shocking" police inquiry, which concludes the deaths were an accident and that driver Henri Paul was drunk.
Mohammed al Fayed called himself "the only person who knows the truth" about the death of Diana and his son.
Al Fayed, who owns London's famous Harrods department store, told the BBC: "How can I accept something really shocking? "I know deep in my heart that I'm the only person who knows the truth."
A memorial to Diana and Dodi at Harrods department store in London.