A preliminary judicial investigation was carried out, which, due to the complexity of the case, lasted until February 1, 2006. The preliminary investigation did not point out any persons connected with the case. The investigation was hindered by the fact that Vodafone disabled the interception system, and therefore locating the intercepting phones was no longer possible (the phones were apparently switched off), and that Vodafone had incorrectly purged all access logs. Police rounded up and questioned as suspects persons who called the monitoring phones, but all callers claimed they called these phones because their number was previously used by another person.