NEW YORK (CNN/Money) - Citigroup said Monday that personal information on 3.9 million consumer lending customers of its CitiFinancial subsidiary was lost by UPS while in transit to a credit bureau -- the biggest breach of customer or employee data reported so far.
Citigroup, the nation's biggest financial services company, said that UPS lost the tapes while shipping them to a credit bureau in Texas.
The tapes covered CitiFinancial customers and about 50,000 customers with closed accounts from CitiFinancial Retail Services. Customers of CitiFinancial's auto and mortgage businesses were not affected.
CitiFinancial is inviting customers to enroll via a toll-free number, 1-888-469-8603, in a free credit monitoring service for 90 days. It said it earlier enrolled the customers in a separate service to help prevent identity theft.
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