It has been reported that the White House has confirmed it was the target of a hacking attempt but the breach was against an unclassified network.
A US administration official told the media that there was no indication any data had been removed.
The conservative Washington Free Beacon reported on Sunday that the attack was linked to the Chinese government had breached the White House Military Office.
The White House refused to say if the attack originated in China but described it as a “spear-phishing” attempt.
This kind of attack usually works by sending fake e-mails that look like legitimate correspondence often tailored specifically to its target audience but which links to a malicious website or file attachment.
A top US cyber defence official told Reuters last week that Cyber-attacks from Chinese-linked hackers have been an increasing concern among US government offices, including the Pentagon.
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