By Andrew Ackerman and Andrew R. Johnson 
 

WASHINGTON--The Securities and Exchange Commission is investigating the bankrupt mortgage subsidiary of Ally Financial Inc., as part of a probe into possible fraud related to the unit's loan-origination and underwriting practices.

In court filings, the SEC said it is examining Residential Capital LLC loans that were bundled into mortgage-backed securities. The agency said it began a formal investigation into ResCap on Feb. 22.

The agency said it is "investigating ResCap's origination and underwriting practices" for the approval of loans that were tied to mortgage-backed securities.

The SEC documents were filed Monday as part of a request by the agency to force R.R. Donnelley & Sons Co. (RRD) to turn over documents it drafted as part of due diligence for the banks that underwrote the securities, according to the filings.

The SEC subpoenaed R.R. Donnelley in June, but the company refused to comply fully with the subpoena, the agency said.

Spokeswomen for Ally and ResCap declined to comment, as did a spokesman for the SEC. An R.R. Donnelley spokesman couldn't immediately be reached for comment.

ResCap, once one of the largest subprime lenders in the country, filed for Chapter 11 bankruptcy on May 14 as litigation over faulty mortgage securities mounted and bond-related payments loomed. Ally, which isn't part of the bankruptcy, hopes that ResCap's filing will allow it to sever itself from costly litigation that has been a drag on the company and focus solely on its core auto-lending and online-banking operations.

ResCap said in a bankruptcy-court filing in May that 27 lawsuits regarding mortgage-backed securities had been filed against it as well as related companies that aren't part of the bankruptcy, including Ally and its bank subsidiary. A major component of the mortgage lender's bankruptcy is a proposed $8.7 billion settlement ResCap has reached with various MBS investors.

Reuters reported on the SEC investigation earlier Tuesday.

Write to Andrew Ackerman at andrew.ackerman@dowjones.com.

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