Societe Generale SA, Royal Bank of Canada, and Bank of AmericaCorp. are among nine additional banks that were subpoenaed in NewYork and Connecticut's probe of alleged manipulation of Libor, aperson familiar with the matter said.

The subpoenas, issued by New York Attorney General EricSchneiderman starting in August, bring to 16 the total number ofbanks that have been subpoenaed in the states' investigation, saidthe person, who asked not to be identified because there wasn'tauthorization to speak publicly.

Schneiderman and Connecticut Attorney General George Jepsen arejointly investigating claims that banks rigged the London interbankoffered rate, or Libor, a worldwide benchmark for borrowing. Thesame person said in August that seven banks were subpoenaed intheir investigation, including JPMorgan Chase & Co. andBarclays Plc.