(Bloomberg) — The FBI said it's close to finding the hackers responsible for the attack on health-insurance company Anthem Inc. that exposed personal data on about 80 million customers.

Federal Bureau of Investigation officials are still deciding whether to publicly reveal information about the attackers in one of the biggest thefts of medical-related customer data in U.S. history, Robert Anderson, the bureau's executive assistant director for cybersecurity, said Tuesday.

Agency officials don't want to compromise investigations or operations by any disclosures, he said.

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