(Bloomberg) -- Hackers in China breached U.S. Office of Personnel Management computers and stole personal records of as many as 4 million current and former federal employees, a U.S. official said.

The hackers, believed to have links to the Chinese government, got into the government computer system last September, according to the official, who asked for anonymity to discuss the investigation.

A U.S. intelligence official said, also speaking on condition of anonymity, Chinese hackers appear to have mounted an effort to get personnel files, health-care records and other personal information on millions of government employees and contractors.

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