STAMFORD, Conn. -- Federal prosecutors are investigating accounting practices at Xerox Corp. that were previously reviewed by securities regulators in a probe that led to a record $10 million civil penalty against the copy machine maker.

The Stamford-based company issued a statement Monday night announcing the new investigation and saying it would cooperate with prosecutors.

Xerox settled allegations by the Securities and Exchange Commission in April. The SEC alleged that the company used a variety of what it called "accounting tricks" and "accounting opportunities" to boost earnings by about $1.5 billion, misleading investors about its results.

Xerox spokeswoman Christa Carone declined to comment Monday on the new investigation.