The United States Coast Guard, working jointly with the U.S. Navy, has intercepted and seized a Nigerian-owned supertanker, MT Skipper, over serious allegations ranging from crude oil theft to piracy and other transnational crimes.

The operation, announced earlier this week, marks one of the most high-profile maritime crackdowns involving a vessel linked to Nigeria.

The Skipper, a 20-year-old Very Large Crude Carrier (VLCC), was reportedly being operated by Nigeria-based Thomarose Global Ventures Ltd., although international registry records list its registered owner as Triton Navigation Corp. of the Marshall Islands. U.S. authorities said the tanker attracted attention after it was found illegally flying the Guyanese flag, a violation that classified the vessel as “stateless” under international maritime law and opened the door for foreign enforcement action.

According to U.S. officials, the vessel is under investigation for suspected large-scale crude oil theft, possible involvement in maritime piracy, and links to broader criminal networks engaged in transnational smuggling.

Preliminary reports also suggest that the tanker may have been tied to activities such as drug trafficking and money-laundering operations, prompting a multi-agency probe.

The interception was carried out as part of Washington’s expanded maritime security operations.

U.S. President, Donald Trump publicly acknowledged the seizure, describing it as a necessary step to curb illegal oil movements and dismantle networks that exploit global shipping lanes for criminal purposes.

Guyana’s Maritime Administration Department has since confirmed that the Skipper was never authorized to fly its national flag, debunking the vessel’s claimed identity and strengthening the legal basis for its detention.

Nigerian corporate records also show that the company linked to the ship, Thomarose Global Ventures Ltd., is currently inactive, raising further questions about the tanker’s operational legitimacy.

The seizure comes at a time when global concern over crude oil theft and illicit shipping has intensified. Nigeria has long battled pipeline vandalism, illegal bunkering, and smuggling operations that cost the country billions of dollars annually and distort global market flows. International partners, including the U.S., have stepped up efforts to monitor suspicious vessels believed to be involved in such activities.

The tanker is now in U.S. custody pending full investigation. No official charges have yet been announced, but maritime security analysts say the case could have diplomatic and commercial implications depending on the outcome of ongoing inquiries.

The incident underscores the growing international scrutiny on vessels associated with oil-rich West Africa and highlights the evolving sophistication of transnational maritime crime networks.