It was a walker who discovered the 14-year-old's body in a field. A post mortem was carried out on Saturday but the exact cause of the girl's death has not yet been established.
A spokeswoman for the public prosecutor's office says that there is evidence that a third party is implicated.
Wenke Roggen: "Foul play is involved. This could be murder. Because of this an examining magistrate has been put on the case."