Citigroup said computer hackers breached the bank's network and accessed data on hundreds of thousands of bank card holders in the latest of a string of cyber attacks on high-profile companies.
Citigroup said about 1 per cent of its card customers were affected by the breach, which was discovered during routine monitoring.
The names of customers, account numbers and contact information, including email addresses, were viewed, Citigroup said. However, it said other information such as birth dates, social security numbers, card expiration dates and card security codes (CVV) were not compromised.
"We are contacting customers whose information was impacted. Citigroup has implemented enhanced procedures to prevent a recurrence of this type of event," the company said.
Citigroup joins a growing list of companies that have suffered cyber attacks.
Data storage firm EMC Ltd offered to replace millions of electronic keys after hackers used data from its RSA security division to break into the network of arms supplier and information technology provider Lockheed Martin .
Electronics giant Sony has reported several attacks, including one in which hackers accessed the personal information on 77 million PlayStation Network and Qriocity accounts. Sony was criticised for a delay in telling account holders that their information had been stolen by hackers.
Google revealed a major attack on its Gmail accounts targeting, among others, senior US government officials that it said appeared to originate in China. Washington has scrambled to assess if security had been compromised by the raid on Google's Gmail system, reflecting increasing concerns among global policymakers about cyber security.
Citigroup said it had discovered the unauthorised access at Citi Account Online, an online banking service, through routine monitoring.
In April, Citigroup global enterprise payments head Paul Galant, who previously ran the bank's credit card unit, said security breaches are a fact of life for financial institutions.
Reuters
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