A couple who witnessed the aftermath of the crash which killed Princess Diana say her death was 'no accident.'
Robin and Jack Firestone claim they still live in fear for their lives after reporting seeing two dark and mysterious cars at the scene.
Princess Diana, 36, her lover Dodi Fayed, 42, and their driver Henri Paul, 41, all died in the Pont de' l'Alma tunnel, Paris, on August 31, 1997.
Robin and Jack Firestone (pictured) claim they still live in fear for their lives after reporting seeing two dark and mysterious cars at the scene of Princess Diana's fatal crash 22 years ago
Princess Diana (left) and her lover Dodi Fayed (right) were killed in a car crash in Paris
The couple believe Princess Diana's death was not an accident after witnessing the aftermath of the crash (pictured)
The Firestones told the Express they were on their way to their hotel in the back of a taxi when they drove into the tunnel just minutes after the collision.
They say they saw two 'formal' and 'awkwardly parked' cars which had stopped at the front of the Princess' Mercedes S280.
But it was only the next morning they realised the woman inside the Mercedes was Diana.
The property owners found a French police officer to report the mysterious cars they'd spotted.
Robin said: 'We went up to him and I said "listen we were in the tunnel last night and we need to talk to the police because there are things that we saw".
'Without hesitation, he said they have enough witnesses. Don't worry about it.
'We were dumbfounded. One of the most famous women in the world is killed and they don't want to speak to witnesses.'
Despite being eyewitnesses, they claim they were stopped from giving evidence by French authorities and then the British because their testimony was so controversial.
They were not even called to the first inquest which took place in London in January 2007.
The Pont de' l'Almal tunnel where Princess Diana, her lover Dodi Fayed and driver Henri Paul were killed in a crash
Months later, when it was ruled the inquest should be heard in front of a jury, Dodi's father Mohamed Fayed made contact with the Firestones.
In September 1999, French Judge Herve Stephan had thrown out charges of manslaughter against nine photographers and a press motorcyclist, saying that drugs and alcohol taken by driver Henri Paul, as well as excessive speed, caused the deaths.
But Mr Fayed was convinced his son and Princess Diana were murdered.
The couple met with Fayed's legal team in New York, who then presented their statement to Lord Justice Scott Baker, who was chairing the inquest.
However, Robin claims it was 'clear' neither the English or French wanted to listen to her testimony.
Robin Firestone says she hopes Prince William and Harry will find out what really happened to their mother
A jury returned a verdict of 'unlawful killing' by Henri Paul and the paparazzi pursing the Princess' car.
Robin said: 'We still live in fear today because of what we saw and what we were told.
'I do not think Diana's death was an accident, and the action of the authorities makes me believe that to this day more than ever.
'The whole crash was an establishment thing.
'I hope that one day, as William and Harry grow older that they want to take responsibility to find out what really happened to their mother.'
Robin and Jack say they believe 'something bad' could happen to them in a bid to silence their testimony.
They are so fearful of reprisals, they now even live in a gated complex.
Jack is reportedly in talks with a production company about turning his book Chasing Diana into a film.