Citigroup said on Wednesday that hackers had breached the bank's network and may have gained access to the personal data of hundreds of thousands of bank card customers, according to a report.
Customer names, account numbers and contact information, including email addresses, were reportedly accessed during the breach, which was discovered in May during routine monitoring. However, no social-security numbers, birthdates or security codes were accessed, according to the report in the Financial Times.
Citigroup told the newspaper that the breach affected about one percent of its 21 million customers. Citigroup representatives did not immediately respond to a request for comment. The breach adds the bank's name to a growing list of companies that have suffered an intrusion in recent months.
For more on this story, read Report: Hackers accessed Citigroup customer data on CNET News.