BOSTON – TD Bank told Attorney General Martha Coakley’s office this month that it lost unencrypted backup tapes containing personal information, including account information and Social Security numbers, for more than 73,000 Massachusetts customers.

The bank said notices are being sent to more than 267,000 potentially affected consumers nationwide beginning this week after two data tapes were lost in March.

TD Bank says it is unaware of any misuse of personal information at this time, but it cannot rule out that possibility, according to a news release.

Coakley’s office is advising costumers to carefully monitor their credit card statements and report potential fraud to one of the three credit bureaus.

More information is available at www.mass.gov/ago. •