Homeland Security and the Federal Bureau of Investigations released a joint report at the end of last month issuing a "urgent" alert about hackers penetrating the networks of nuclear facilities.
According to the New York Times, who obtained the June 28 joint report Thursday, hackers have targeted both nuclear and manufacturing facilities, such as the Wolf Creek nuclear power plant in Burlington, Kansas, who claimed their operations systems have not been compromised.
It's unclear whether the hacks were attempts at stealing nuclear or industrial codes or part of an attempt to "cause destruction."
This publication of intelligence from the joint FBI/Homeland Security report comes after late June report claiming Homeland privately warned businesses about potential hacks of nuclear or energy firms. It also comes just over six months after a Vermont electric utility was hacked by Russian operatives in late 2016.