A Greek prosecutor has launched an investigation into whether any laws were violated after former finance minister Yanis Varoufakis revealed plans to hack into tax codes and create a parallel payment system, court officials said on Wednesday. The probe will not focus on Varoufakis himself, since Greek courts can only investigate those who are not ministers or lawmakers, who enjoy parliamentary immunity from prosecution. Varoufakis this week confirmed he assembled a small team to prepare a parallel payment system as part of a so-called "Plan B" in case Greece was forced to leave the euro zone, prompting shock and outrage from opposition lawmakers who have demanded an inquiry into the matter.