Nuclear and other energy providers have been advised by the US Department of Homeland Security (DHS) and the FBI that hackers might be trying to breach their computer systems.
There is no threat to public safety, the DHS said on Friday in a statement.
The DHS said hackers appear to have tried to breach the business and administrative networks of the facilities.
It did not identify the facilities.
The DHS and the FBI routinely advise the private sector of possible cyberthreats to help officials protect potentially vulnerable networks.
The statement came amid multiple news reports that nuclear and electrical power may have been targeted by hackers.
Both Reuters and the New York Times have previously reported government warnings about the hacking efforts.
The Nuclear Energy Institute said last week that no nuclear reactors were affected.
Had any facilities been impacted by a cyberattack, a publicly available report would have to be made to the US Nuclear Regulatory Commission.
Fears of hackers targeting US infrastructure, particularly nuclear facilities, have long persisted.
David Lochbaum, a nuclear engineer and director of the nuclear safety project at the Union of Concerned Scientists, said the nuclear safety systems are generally out of the reach of hackers in analog systems.
However, business and administrative systems nonetheless contain valuable information about nuclear facilities, including maintenance schedules.
Hackers targeting such facilities are routinely looking for easy to access systems and information and try “to exploit [system weaknesses] and get as much information as possible,” Lochbaum said.
Among the most serious immediate risks, beyond someone using hacked information as part of a larger physical attack, is someone targeting the offsite power grid and causing an economic disruption, Lochbaum said.
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