Hackers were successful in accessing the records of millions of current and former customers, as well as employees of Anthem Inc., the second largest health insurer in the U.S. The sophisticated attack involved a customized software program which captured as many as 80 million records including social security numbers, medical IDs, birthdates, street addresses, email addresses, employment information and even income data.

Anthem President and CEO Joseph Swedish told members in a letter that "based on what we know now, there is no evidence that credit card or medical information, such as claims, test results or diagnostic codes were targeted or compromised."

The company discovered the attack on January 29, immediately contacted the Federal Bureau of Investigation and continues to assist in their investigation. Anthem has also retained cybersecurity firm Mandiant to work with them on identifying the vulnerabilities in their system that led to the breach. The company has handled high-profile breaches for Sony Pictures Entertainment and JPMorgan Chase & Co.

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