According to a joint statement shared with TechCrunch, the agencies boarded the vessels between August 21 and August 24 to “ensure integrity of the vessel’s operational and information technology systems following indications that the networks of both vessels were compromised.” The Coast Guard released photos of FBI agents and staff climbing aboard one of the tankers.
The statement said the captain, crew, and onshore staff of the vessel’s owner cooperated with the boarding and that there were “no reports of operational disruptions, vessel instability, physical danger to crews, or environmental impacts.”
CBS News identified one of the tankers as the VL Prosperity, a 333-meter oil tanker capable of holding over 2 million barrels of oil, currently located in the Gulf of Mexico. Citing Iranian media, CBS reported that hackers compromised the ship on August 7 while it was traveling from Egypt to the United States, interfering with its speed and fuel systems and causing a loss of communications for more than a day.
The U.S. is investigating whether Iran is behind the attack, according to CBS. Iranian-backed hackers have launched multiple cyberattacks in recent months following the U.S. and Israel-led war against Tehran, including a destructive hack at medical device maker Stryker, a breach of the Los Angeles transit system, and compromises of over a hundred U.S. water facilities. The Cybersecurity and Infrastructure Security Agency has described the attacks as “opportunistic."