Citigroup Inc. said Thursday that hackers accessed the credit card information of North American customers, in an online security breach affecting about 200,000 accounts.
The bank said it recently discovered during routine monitoring that account information for about 1 percent of customers was viewed.

Citi has more than 21 million credit card customers in North America, according to its 2010 annual report. The New York-based bank didn't say exactly how many accounts were breached.

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