The Massachusetts state attorney general's office and the U.S. Attorney's Office for the Massachusetts District have stepped up two separate investigations into the financial dealings of former First Albany Corp. vice chairman Mark S. Ferber, according to sources in the state.

A spokesman in the attorney general's office would neither confirm nor deny the existence of any investigation into Ferber, but several Boston-based investment bankers said they expect to be subpoenaed by Attorney General L. Scott Harshbarger in reference to their past relationships with Ferber.

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