There are two versions existing, the international one running 104 minutes (released released worldwide) and the shorter one running 89 minutes (released in France and USA).
The 89 minute US version omits a few key scenes. They are:
Michael and Alex visit Michael's mother's grave.
Michael and Alex stakeout Simone's place at night.
While Simone is in custody, Belgado tries to rape her, but Simone knees him in the groin.
The international version ends with Stefano Mainetti's score, while the US version ends with the dance-pop song from the club scene. Mainetti's score is also used more frequently in the US version.