A data security breach that has spurred at least two large banks to cancel thousands of customer debit cards appears to be connected to an older ongoing investigation in Sacramento, the FBI said. Scores of Bank of America and Washington Mutual customers have received notifications from the banks that their debit cards were cancelled because of a breach at a “third-party” establishment. Another law enforcement official, FBI Special Agent John Cauthen, said the bureau is part of a joint investigation into the matter along with the Secret Service. Cauthen said the FBI believes the case is tied to a security breach first reported in The Sacramento Bee last November. In that case, the Golden 1 Credit Union canceled about 1,500 debit cards after being alerted to possible fraud in the Sacramento area. News of a wider problem arose this week when The San Francisco Chronicle wrote that Bank of America had begun canceling numerous debit cards.