The OAG has been investigating the purchase of CTX bomb-scanners for the airport ever since Jaruvan Maintaka returned to her post as auditor-general. She has looked into the budget for state mega-projects, including the CTX scanners.

She said on Wednesday that the OAG's investigation had moved ahead, particularly in connection with the scanners. OAG officials have identified six areas of potential wrongdoing. 

However, she declined to discuss the case in detail because she has yet to turn over relevant documents to the State Audit Commission.

The OAG source said yesterday that although Jaruvan has declined to say anything specific about investigation, the OAG had in fact found irregularities and that someone would have to take responsibility for the damage.

Companies allegedly involved in the scandal included Airports of Thailand Plc, ITO Consortium, and Patriot Business Consultants.