Chinese hackers have attacked the US weather satellite network, causing services to be sealed off for a period.
The US is currently talking of a cooling in trade hostilities that would ensure the smooth passage of technology sales, but the cyber attack allegations still keep coming.
The Washington Post reported that the weather satellite attacks happened in September, but were not revealed until late October.
The paper claims to have three sources who confirmed the attacks, but that one of the victims, the National Oceanic and Atmospheric Administration (NOAA), did not mention the assault at the time.
The Washington Post's insiders said that the authorities were not informed of the NOAA event, and that the only admission from the NOAA was a note about "unscheduled maintenance".
However, the NOAA confessed to the attacks in a statement this week, telling the paper that it reacted immediately and that there was no long-term impact.
Officials spoken to by the paper expressed disappointment at the news that the NOAA did not report the attacks to the authorities.
Todd Zinser, a Commerce Department inspector general, said that the incident is under investigation.
"We're in the process of looking into the matter, including why the NOAA did not comply with the requirements to notify law enforcement," he is reported as saying.
The US and China are close to a trade resolution, but the two countries have a tense relationship, each accusing the other of hacking or snooping.
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