The Coast Guard and FBI boarded two foreign vessels coming to the United States last month to investigate potential cyberattacks on the ships, according to a joint statement from the agencies Wednesday.

The “joint offshore security boardings” of the two commercial ships in the Gulf of Mexico on Aug. 21 and Aug. 24 “were designed to ensure integrity of the vessel’s operational and information technology systems following indications that the networks of both vessels were compromised,” according to the joint statement.

“Currently, there are no reports of operational disruptions, vessel instability, physical danger to crews, or environmental impacts,” the statement reads. “The Coast Guard is actively managing communications with port operators, vessel owners, and local maritime stakeholders to ensure port operations continue safely and without interruption.”

The vessels were reportedly tankers carrying oil and natural gas, and the first got hacked in the Strait of Gibraltar and lost communication for over 30 hours. Authorities were said to be  investigating whether Iran, or perhaps another group seeking to exploit the conflict between Iran and the United States, was behind the attacks.

Coast Guard cyber teams have been investigating “dark fleets” carrying sanctioned oil from Iran and Russia, which rely on digital masking to hide their operations and carry enhanced cyber risks, The Wall Street Journal reported in June.

Then-President Joe Biden signed an executive order in 2024 giving the Coast Guard additional authorities to respond to cybersecurity incidents, citing the risks that a maritime cyber incident could cause “cascading” harm to the global supply chain.

The Aug. 21 boarding party included Coast Guard law enforcement personnel, Coast Guard Cyber Protection Team members, a vessel inspector and FBI Cyber Action Team operators, who boarded “to conduct a comprehensive cyber security boarding and investigation,” according to the agencies’ joint statement. A similar team made up the Aug. 24 boarding party.

“The captain, crew, and shore-side corporate staff were critical partners in helping to ensure the threats were mitigated,” the statement reads.

Top Trump administration cyber officials have refused to answer questions from reporters recently about Iranian cyberattacks during the Middle East conflict. Trump himself has rejected the idea that Iran was behind a recent spate of attacks on U.S. water facilities.

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The U.S. Coast Guard said it is monitoring the aftermath of a cyberattack that disrupted gate operations at all three of North Carolina’s port facilities this week, though it offered few details as the investigation into the breach continues.

A Coast Guard spokesperson told CyberScoop that the branch’s IT unit was coordinating with partner agencies while conducting the investigation. A spokesperson for CISA did not respond to CyberScoop’s inquiry by press time. 

The Coast Guard is one of several state and federal partners the North Carolina State Ports Authority brought in after discovering the attack on its systems earlier this week. The breach affected the Port of Wilmington, the Port of Morehead City and the Charlotte Inland Port, forcing the agency to delay gate openings and shift to manual processing while it worked to contain the intrusion.

A spokesperson for the ports authority told local media its IT team activated the agency’s cybersecurity contingency plan upon discovering the attack, as well as reaching out to state authorities for further support. 

As of Friday morning, a notice on the ports website said a normal operating schedule was in effect while the IT teams continued their investigation. It has not disclosed the nature of the attack, which systems were affected, or whether vessel operations, cargo-handling equipment or rail services were disrupted.

North Carolina’s ports serve as a trade hub along the southeastern U.S., with Wilmington in particular functioning as a gateway for agricultural exports, retail goods and raw materials.

The North Carolina Ports Authority said it would continue posting updates on its website and pointed users toward its email alert service for further information. It did not provide an estimate of how much truck or cargo traffic has been affected by the disruption.

The incident adds to a recent string of cyberattacks against water and wastewater systems in the U.S., which also fall under the umbrella of “critical infrastructure.” While there has been no official attribution, experts have expressed confidence that Iranian actors are responsible for the attacks on water systems.

As of Friday morning, there has been no public information tying the port cyberattack to a specific actor.  

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