Washington ? The Justice Department has decided not to file criminal charges against the former head of a division at American International Group Inc. whose dealings in mortgage-related securities nearly bankrupted the company and led to a controversial government bailout, according to lawyers involved in the cases.

The decision appears to bring an end to the criminal investigation of AIG, but a Securities and Exchange Commission probe into AIG and the dealings of its London-based Financial Products subsidiary is continuing and could lead to a civil securities fraud case.