The FBI is investigating

Fannie Mae

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,

Freddie Mac

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,

American International Group

(AIG) - Get American International Group, Inc. Report

and

Lehman Brothers

, the four financial firms whose collapse led to a $700 billion

bailout

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plan by the U.S. government, according to published reports.

Two law enforcement officials said the FBI is looking at potential fraud by the companies, reports the

Associated Press

.

The inquiries will focus on the financial institutions and the individuals that ran them, a senior law enforcement official said, the

AP

reports.

Lehman

and

AIG

declined to comment, the

Wall Street Journal

reported. A spokeswoman for the Federal Housing Finance Agency, which regulates Fannie and Freddie and has both companies in conservatorship, also declined to comment.

This article was written by a staff member of TheStreet.com.