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Iranian hackers’ targeting of US critical infrastructure has escalated since start of war, US says

By Thomson Reuters Apr 7, 2026 | 1:25 PM

By AJ Vicens

April 7 (Reuters) – Iranian hacking campaigns targeting equipment used across multiple U.S. critical infrastructure sectors are escalating in response to ​hostilities, U.S. cybersecurity, law enforcement and intelligence ‌agencies said on Tuesday.

The hackers are targeting publicly exposed programmable logic controllers and supervisory control and data acquisition displays, according to the advisory.  The targeted devices are ‌used ​to interact with or control ⁠certain critical infrastructure-related equipment ⁠and systems, the advisory said.

The hackers are seeking to cause “disruptive effects within the United States,” according to the advisory. “In a few cases, ​this activity has resulted in operational disruption and financial loss.”

The warning comes as President Donald ⁠Trump warned that “a whole ⁠civilization will die tonight” if Iran ​fails to make a deal with the U.S., while ​Iran said it would attack additional infrastructure ‌targets across its Gulf neighbors.

In some cases the hackers interacted with data files in the systems to alter display data, while also extracting device ⁠project data, according to the advisory.

The hacking operations targeted unnamed critical infrastructure organizations in the government services ⁠and facilities, water ‌and wastewater systems and energy ⁠sectors, according to the advisory.

The advisory ​was ‌issued by the FBI, the National ​Security Agency, ⁠the Cybersecurity and Infrastructure Security Agency, the Environmental Protection Agency, the Department of Energy and U.S. Cyber Command’s Cyber National Mission Force.

The FBI declined additional comment.

(Reporting by AJ Vicens in Detroit; Editing by ​Matthew Lewis)