The letter said the "attack" was in late August. It came from outside the US and they have retained a computer security firm to investigate.
This identity theft is really getting to be a problem! Last year my ssn & personal information was stolen from my state's tax records! The state gave me 1 free year of enrollment with a firm that protects my finances by alerting me anytime an application for a credit card or loan is filed in my name. If I don't personallyapprove it it is denied and an investigation is started to find who applied!