WASHINGTON — SmartPay travel cardholders are being warned to watch their accounts after Bank of America lost data tapes with personal information of about 900,000 federal employees, Pentagon officials said.

Secret Service officials are investigating the misplaced tapes, but only began releasing details of the error in the last few days because of security concerns.

Bank representatives and Defense Department officials do not believe any of the information has been misused thus far. The lost information includes names, addresses and social security numbers of federal employees.

In a statement, Bank of America spokeswoman Barbara Desoer said the company deeply regrets the loss of customer information, and “we take our responsibilities for safeguarding it very seriously.

The company will not hold cardholders liable for any unauthorized use of their cards, though no such abuse has been reported yet.

News reports had initially put the number of employees affected at 1.2 million people. Individuals whose information was lost will receive a letter from the company explaining the situation and assuring customers they are monitoring the situation.

The bank has set up a toll-free phone number, (800) 493-8444, where customers can ask additional questions. The company is recommending that all affected cardholders watch their travel accounts and credit reports for unusual activity.

The company has agreed to make free credit reports available to customers upon request.

In a statement, Teresa McKay, the Defense Department’s deputy chief financial officer, echoed the bank’s advice.

“It’s always prudent for any cardholder to monitor their monthly statements and dispute any charges they may question, and also it’s important for all of us to get a credit report at least once a year and look at the content of that report,” she said.

Pentagon officials said the DOD contracts out about 1 million travel cards annually to Bank of America, and there are no current plans to change that arrangement.

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