BOSTON (Reuters) – U.S. attorneys general have launched a multi-state investigation into a breach in which criminals gained access to a repository of some 200 million social security numbers through a unit of data provider Experian Plc. We are investigating, said Maura Possley, a spokeswoman for Illinois Attorney General Lisa Madigan. Its part of a multi-state investigation. Jaclyn Falkowski, spokeswoman for Connecticut Attorney General George Jepsen, said that Connecticut is looking into the matter also. Neither spokeswoman would say if other states were involved. …