The U.S. Coast Guard confirmed late Tuesday that FBI agents and military forces conducted a boarding of an oil vessel to investigate a security breach. This operation is part of a broader federal probe into a cyberattack that hit two foreign tankers while they were carrying oil and gas cargoes through the Strait of Gibraltar in August.

The targeted shipments of oil and gas faced increased risks of explosion and collision, the Wall Street Journal reported. American officials stated the attack occurred while the two foreign tankers were en route to U.S. shores, with one ship specifically bound for Texas.