The logo of American International Group Inc. (AIG) on the outside of their corporate headquarters in New York, November 10, 2008. REUTERS/Mike Segar

NEW YORK (Reuters) - Former American International Group Inc executive Joseph Cassano is under investigation by U.S. prosecutors for possibly misleading auditors and investors about subprime mortgage-related losses, according to a Bloomberg report citing people familiar with the probe.

The report said investigators are asking auditors at PricewaterhouseCoopers about memos they wrote last fall on how Cassano and other AIG executives valued contracts protecting $62 billion in mortgage-backed securities.

The U.S. government is also investigating AIG’s reliance on valuations that have been questioned by auditors and banks, according to the report.

Cassano previously led AIG Financial Products, the source of billions of dollars of losses which led to the insurance company needing to be rescued by the U.S. government in a $85 billion deal in September.

In October, U.S. lawmakers criticized AIG for giving Cassano a $1 million-a-month consulting contract after he retired in March.

An AIG spokesman was not immediately available for comment.