SINGAPORE - The Commercial Affairs Department (CAD) interviewed several key executives of technology firm Trek 2000 last week.

The firm, which invented the thumb drive, said in a statement to the Singapore Exchange (SGX) late on Wednesday night (June 1) that its chief executive officer and chairman, Mr Henn Tan, was interviewed by the CAD on May 30.

Other key executives interviewed by the CAD last week included chief financial officer and executive director Gurcharan Singh, president of regional sales Foo Kok Wah and executive director Poo Teng Pin.

The firm said that the board has been informed that all four key executives will continue to assist with CAD's investigations. They have been released on bail.

No formal charges have been laid against them, said the firm.

The company said in a SGX statement last week that Mr Gurcharan had been interviewed in an investigation of a possible offence under the Penal Code.

He had been asked to produce all personal banking, diaries, notebooks, phone books, e-mail and other storage devices.

The CAD also requested information and data relating to the company's financial performance from financial years 2011 to 2015, as well as all documents relating to transactions with Taiwanese manufacturing firm Unimicron Technology and Indian sign manufacturer Colite Technology.