In June 2014, Polish newsmagazine Wprost released excerpts from tape recordings of private conversations between senior Polish officials taking place across restaurants in Warsaw dating back to the summer of 2013.
The materials, which Stonoga claimed to have found on Chinese internet sites, include testimony from the accused and from witnesses, along with personal information such as addresses and phone numbers, and evidence for the case.
Polish authorities have confirmed that this may be the largest leak of materials for an ongoing investigation in the country's history.
The leak is now subject to criminal investigation by the Warsaw District prosecutor's office.
Prime Minister Ewa Kopacz called together representatives from the security services, and the ministries of defense, interior and justice for council over the matter.
On Tuesday, the attorney general's office confirmed that the materials for the case were presented for examination and review to suspects, the defense and their lawyers, warning that those responsible for the leak will be subject to criminal prosecution.