New York (CNN Business) A massive data breach at a hotel group owned by Marriott has been traced to Chinese hackers working for the Ministry of State Security, the country's civilian spy agency, according to The New York Times.

The hack exposed data from approximately 500 million Starwood hotels customers. It also included health insurers and the security clearance files of millions more Americans, according to two people briefed on the investigation, the Times reported.

CNN Business has not independently confirmed the report.

The Times also cited four unnamed US officials who said there could be indictments against Chinese hackers working for the intelligence services and the military. It said the Trump administration also plans to declassify intelligence reports to reveal Chinese hacking efforts dating to at least 2014.

The report comes amid growing tensions between the United States and China. The Trump administration continues to threaten China with taxes on hundreds of billions of dollars of exports to the United States if the countries cannot reach a trade resolution in the coming months.

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