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Security researcher and journalist Brian Krebs noted on its blog post, pointing a Chinese state-sponsored hacking group known variously as “ Deep Panda ,” “ Axiom ,” “ Group 72 ,” and the “ Shell_Crew ”, may have been behind the attacks on Premera and Anthem.

A US-based health insurance company, have admitted that itswere accessed by hackers. The announcement has been done by the company itself on Tuesday.Hackers gained unauthorized access to customers' personal information, including names, birthdates, Social Security numbers, and claims information during the May 2014 intrusion, said Premera. On the basis of the investigation, company revealed none of the information or data has been removed from its system or misused. The customer information that may have been compromised dates as far back as 2002, Premera said.