U.S. authorities are investigating a cyber incident involving the propulsion system of a large oil tanker that was approaching the Texas coast, according to officials familiar with the investigation. The case involved the VL Prosperity, a very large crude carrier that was reportedly bound for Galveston.

Investigators from the Federal Bureau of Investigation and the U.S. Coast Guard reportedly found evidence that unauthorized actors temporarily gained access to a digital system connected to the vessel’s propulsion. Authorities are still examining how the intrusion occurred, how long the access lasted, and what level of control may have been possible.

The FBI said there were no reported operational disruptions, vessel instability, danger to the crew, or environmental effects linked to the incident. The Coast Guard and FBI had earlier boarded the vessel following indications that its operational and information technology networks may have been compromised.

The incident has drawn attention to growing cybersecurity risks in commercial shipping as vessels increasingly depend on connected digital systems for navigation, communications, machinery monitoring, and other shipboard operations. Maritime cybersecurity specialists have warned that unauthorized access to operational technology aboard large tankers could present serious safety risks if critical functions were affected.

U.S. authorities have also been tracking cyber threats involving other commercial vessels, while investigations continue into the source and possible motive behind the reported intrusion. The VL Prosperity remained anchored offshore Galveston based on shipping information cited in the report.