TD Bank (TD) says it has misplaced personal information belonging to more than a quarter of a million customers.

The Canadian bank's $208 billion-asset U.S. subsidiary said Monday the information is stored on data tapes that were lost in transit. The bank says it is working to recover the tapes.

"We have no evidence that the data on these tapes is being used for any inappropriate purpose," bank spokeswoman Rebecca Acevedo said in a statement. "This is an isolated incident that is being internally investigated and has been reported to law enforcement."

"We continue to vigilantly monitor our customer accounts," Acevedo added.

The bank is writing to roughly 260,000 customers whose information is stored on the tapes with offers to monitor their credit and provide protection from identity theft.

TD Bank has about 8 million customers in the U.S.