French authorities are closing in on those responsible for the theft of Michael Schumacher's medical reports.
Medical details about the seven-time World Champion's injuries and treatment following his skiing accident in France were stolen shortly after he left the Grenoble hospital at the end of June.
The documents were offered on sale to the media for 60,000 Swiss francs (£39,000), but Schumacher's manager Sabine Kehm warned that publication of the details would result in criminal charges.
French authorities also launched an investigation and their latest findings have traced the IP address of a computer that was used by the alleged thief to a Swiss company.
"The IP address was located in a helicopter firm in the Zurich area," the prosecutor's office in Grenoble said without revealing the name of the company or person involved.
Officials believe the company was given a copy of the report as they were initially due to transfer Schumacher from Grenoble to the University Hospital of Lausanne in western Switzerland.
The prosecutor added that the document did not appear in Schumacher's final medical report and was likely to have been a draft which had been left in a hospital bin.