Federal authorities have widened an ongoing investigation into cyberattacks aimed at critical U.S. water infrastructure. The probe follows a series of security breaches involving programmable logic controllers (PLCs)—the industrial computers responsible for managing water treatment and distribution processes. According to reports, these incidents have impacted facilities across Minnesota and at least six additional states.

The investigation highlights growing concerns regarding the vulnerability of the nation’s water systems to digital sabotage. While the specific identity of the attackers remains a primary focus for the FBI, the scope of the investigation suggests a coordinated effort rather than isolated incidents. The breaches have raised alarms among cybersecurity experts and government officials, who warn that the compromise of PLCs could potentially allow unauthorized actors to manipulate water pressure, chemical levels, or flow rates.

Currently, the FBI and the Cybersecurity and Infrastructure Security Agency (CISA) are working to identify the extent of the damage and the methods used by the perpetrators. While the investigation is active, federal agencies have not yet released definitive information regarding the specific entities behind the attacks or the full extent of the operational disruptions caused by the breaches. The expansion of the probe indicates that authorities are treating these incidents as a significant threat to national security, focusing on how tech suppliers and infrastructure operators can better secure their systems against future intrusions.