An Athens prosecutor filed charges of bribery and money laundering in a corruption investigation looking into deals between the Greek state and German industrial giant Siemens.
An Associated Press report quoted an official in the prosecutor's office saying that the criminal charges concerned transactions related to security systems for the 2004 Athens Olympics and purchases by Greece's largest telecom company, OTE, in the late 1990s.
Siemens was involved in both transactions, the report said.
The official spoke on condition of anonymity as he was not authorized to speak about the case to the media.
The charges have not been brought against any individual. Under Greek law, charges can be filed against 'all responsible.'
After this, a broader investigation must be launched, and anyone deemed a suspect in it is considered automatically charged.
So far about 100 people, including former executives in Siemens AG's Greek unit and OTE, have testified to Athens prosecutor Panayiotis Athanassiou during the two-year investigation.
Siemens is being investigated in several countries over allegations of bribery and corruption in its communications group. It has said it is cooperating in all the investigations, and has introduced changes designed to make its corporate structure leaner and more transparent.