It’s scary to think about, but anything that is online is hackable. Including critical infrastructure like nuclear power plants.

It has been reported that U.S. authorities are investigating a cyber intrusion that has hit numerous nuclear power generation sites in the past few months.

The attack has been named “Nuclear 17.” Although details of the investigation of the nuclear industry is tight lipped, the North American Electric Reliability Corp. (NERC) has shared information about Nuclear 17 with its members through NERC’s Electricity Information Sharing and Analysis Center and has posted warnings to electrical grid operators, including a power grid malware known as “CrashOverride.”

The U.S. government has also warned power operators of a cyber campaign by North Korea targeting critical infrastructure sectors in the U.S.