The company says the threats started several weeks ago. But Marcus Neher of the Salzburg Public Prosecutor's office said Friday that "up to now there has only been a claim of contamination," and the company also says that supermarket checks have shown no signs that the product was tampered with.
The company sells its energy drink worldwide. In a statement, it says it is "co-operating closely" with police but offers no details on the perpetrators' demands.
There was also no information on the location of the stores named by the blackmailers.