The Paris prosecutor’s office has opened a manslaughter inquiry into the crash in May of an EgyptAir plane that killed 66 people, saying there is no evidence so far to link it to terrorism.

A spokeswoman for the prosecutor’s office, Agnes Thibault-Lecuivre, said the inquiry was launched on Monday as an accident investigation, not a terrorism investigation. She said authorities were not favouring the theory that the plane had been brought down deliberately.

The decision to open the investigation was based on evidence gathered so far, she said, without elaborating.

The pilots of the aircraft made no distress call, and no group has claimed to have brought down the plane.