Citigroup loses data on 3.9 million customers

Citigroup has lost credit information on 3.9 million of its customers.

The data, which contains customer names, Social Security numbers and payment history information, was stored on computer tapes being sent to a credit bureau, the bank said. It is now mailing a letter to affected customers, advising them of the situation and offering a number of tips on how they can prevent identity theft.

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