From the NY Times:
The Justice Department is investigating whether the nation’s largest credit ratings agency, Standard & Poor’s, improperly rated dozens of mortgage securities in the years leading up to the financial crisis, according to two people interviewed by the government and another briefed on such interviews.
The investigation began before Standard & Poor’s cut the United States’ AAA credit rating this month, but it is likely to add fuel to the political firestorm that has surrounded that action. Lawmakers and some administration officials have since questioned the agency’s secretive process, its credibility and the competence of its analysts, claiming to have found an error in its debt calculations.
[…]
It is unclear if the Justice Department investigation involves the other two ratings agencies, Moody’s and Fitch, or only S.& P.
During the boom years, S.& P. and other ratings agencies reaped record profits as they bestowed their highest ratings on bundles of troubled mortgage loans, which made the mortgages appear less risky and thus more valuable.
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