A pair of Wall Street banks suing Bank of America Corp. over their soured investments in a mortgage vehicle created by Taylor Bean & Whitaker are seeking to look into the business relationship between Freddie Mac and the failed mortgage lender.

BNP Paribas SA and Deutsche Bank AG want to join in on a proposed probe of Freddie Mac, initially requested last week by Bank of America. All three institutions say they've watched Taylor Bean delay its own investigation for months, despite being authorized by the court to subpoena Freddie Mac officials and dig deeper regarding their business dealings with the Ocala, Fla., mortgage lender.

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