— Hackers stole account information of more than 360,000 of Citigroup Inc.’s U.S. credit card customers in a recent data breach, the bank said Wednesday, almost double the number initially thought.
Citi said last week that about 1 percent of its credit card customers had account information hacked online but did not say exactly how many. The actual number of customers affected was thought to be about 200,000, based on Citi’s 2010 annual report, which said the company had roughly 21 million North American credit card customers.
But the true number was actually 360,083, the bank said in a statement posted on its website late Wednesday.
The bank said it discovered on May 10 that hackers used its Account Online system to access the data for North America Citi-branded credit cards issued in the U.S.
