(Reuters) – Data stolen from U.S. government computers by suspected Chinese hackers included security clearance information and background checks dating back three decades, U.S. officials said on Friday, underlining the scope of one of the largest known cyber attacks on federal networks.
The breach of computer systems of the Office of Personnel Management was disclosed on Thursday by the Obama administration, which said records of up to 4 million current and former federal employees may have been compromised.
A total of 2.1 million current U.S. government workers were affected, according to a source familiar with the FBI-led investigation into the incident.
Accusations by U.S. government sources of a Chinese role in the cyber attack, including possible state sponsorship, could further strain ties between Washington and Beijing. Tensions are already heightened over Chinese assertiveness in pursuit of territorial claims in the South China Sea.
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