This was followed by the NYSE suspending trading in Satyam shares the very same day. Trading resumed on January 12 after assessing the company's regulatory filings and its suitability to remain listed at the bourses.

Asked how the US regulator was responding to accounting fraud at Satyam, John Heine, Deputy Director at the SEC Office of Public Affairs, said in an emailed statement, "There has been no public disciplinary action by the SEC (for example a court case or administrative proceedings) involving Satyam."

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Separately, about a dozen class action lawsuits have been already filed in the various US courts on behalf of thousands of American investors in the Indian company, which is also listed in the US and Europe.

The scam is already being probed by various Indian authorities, including by the country's market regulator Securities and Exchange Board of India (SEBI).

SEC is believed to be in touch with its Indian counterpart SEBI on the developments in the probe.