Citigroup Breach Compromised 360,000 Accounts

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Citigroup said Thursday that a cyber attack affected almost twice as many accounts as they first thought. Hackers compromised more than 360,000 credit card accounts in May, accessing names, account numbers and contact information.

Citigroup, the nation's third-largest bank, said more than 200,000 new credit cards were issued with a notification letter. The remaining accounts were either inactive or had already received new cards, the bank added.

The bank was the latest target in a growing list of cyber attacks in recent months. Sony, Google and Lockheed Martin have all been hit by hackers this year.