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NEW YORK (Reuters)—Citigroup Inc. said a cyber attack in May affected more than 360,000 of its customers, or almost twice the initial number that the bank's figures had suggested.
After a week of being pressured over its delayed disclosure of the data breach, the third largest U.S. bank by assets revealed more details in a statement late on Wednesday.
The breach, which Citigroup first made public on June 8, was initially detected on May 10.
A total of 360,083 North American Citigroup credit card accounts were affected by the breach, the bank said.
The bank said about 1% of North American card customers had been affected, reiterating comments made last week.
But the bank's annual report says that number of customers totals 21 million, which initially indicated that about 200,000, rather than more than 360,000, customers had been affected.
Citigroup said it had reissued credit cards to 217,657 accounts along with a notification letter.
NEW YORK (Reuters)—Major U.S. banks came under growing pressure from banking regulators to improve the security of their customer account information after Citigroup Inc. became the latest high-profile victim of a large-scale cyber attack.