Alert from the Government CISA:
The Department of Energy (DOE), the Cybersecurity and Infrastructure Security Agency (CISA), the National Security Agency (NSA), and the Federal Bureau of Investigation (FBI) are releasing this joint Cybersecurity Advisory (CSA) to warn that certain advanced persistent threat (APT) actors have exhibited the capability to gain full system access to multiple industrial control system (ICS)/supervisory control and data acquisition (SCADA) devices, including:
Schneider Electric programmable logic controllers (PLCs),
OMRON Sysmac NEX PLCs, and
Open Platform Communications Unified Architecture (OPC UA) servers
Here is the entire alert: It has not yet been determined WHO is responsible for this, but the "general assumption" is it is Russia. If this in fact is happening, it is an act of war against the US.
APT Cyber Tools Targeting ICS/SCADA Devices | CISA