Investigations by French and British police concluded that their chauffeur, Henri Paul, was driving under the influence of alcohol and prescription drugs; paparazzi chasing the couple are also believed to have contributed to the accident.
Penyelidikan oleh polisi Prancis dan Inggris menyimpulkan bahwa supir mereka Henri Paul, mengemudi di bawah pengaruh alkohol dan obat-obatan; paparazzi mengejar pasangan juga diyakini telah berkontribusi terhadap kecelakaan tersebut.