« Goldman Sachs, Wall Street Banks Under Investigation - SEC Sends Subpoenas In New Mortgage Probe: Sources »

(Reuters) - U.S. regulators have opened a new line of inquiry in their mortgage foreclosure probe and are asking big Wall Street banks about the beginning stages of mortgage securitization, two sources familiar with the probe said.

The Securities and Exchange Commission launched the new phase of its investigation by sending out a fresh round of subpoenas last week to big banks like Bank of America Corp, Citigroup Inc, JPMorgan Chase & Co, Goldman Sachs Group Inc and Wells Fargo & Co, the sources said.

The SEC's subpoenas focus on the earliest stage of the mortgage securitization process, said the sources, who requested anonymity because the probe is not public.

The sources said the SEC is asking for information about the role of so-called "master servicers" -- specialized firms that oversee the selection and maintenance of the large pool of home loans that go into every mortgage-backed bond.

In many cases, Wall Street banks that underwrite mortgage-backed securities either own their own master servicing firms or are closely aligned with one.

The state of Arizona sued Bank of America on Friday, accusing the bank of misleading consumers about its home loan modification process.

One of the sources said the SEC is seeking information about the role banks had in mortgage securitization. The regulator is also looking at the role trustees for the trusts that issued the mortgage-backed securities had in monitoring the performance of the underlying loans.

The SEC is looking at whether loans were properly transferred to the trusts that issued the securities, the source said. The renewed look at the securitization process is an extension of the SEC's preliminary probe into the mortgage mess.

Separately, the SEC is still investigating banks, credit rating agencies and individuals in connection with the 2007-09 subprime crisis. Those investigations center around potential misrepresentations to investors about the value of the mortgage-backed securities that helped fuel the crisis.

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