Hackers have reportedly been breaking into computer networks of companies operating United States nuclear power stations, energy facilities and manufacturing plants, according to a new report by The New York Times.

The Department of Homeland Security and the FBI issued a statement last week confirming the attacks had been occurring since May.

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The Kansas-based Wolf Creek Nuclear Operating Corporation was among one of the companies targeted.

Further details of the attacks were not immediately made known, including the number of successful hacks, whether the hacks were an attempt at espionage or if hackers were looking to steal trade secrets.

According to The New York Times report, it did not appear the hackers got into control systems at any of the facilities.