The operation involved two helicopters, special operations forces, 10 members of the US Coast Guard and 10 Marines, the sources said. The boarding team was composed of the Coast Guard’s Maritime Security and Response Team, an elite maritime interdiction unit based in Chesapeake, Virginia.

Footage posted to social media by US Attorney-General Pam Bondi showed US personnel landing on the ship’s deck by helicopter.

“This seizure, completed off the coast of Venezuela, was conducted safely and securely – and our investigation alongside the Department of Homeland Security to prevent the transport of sanctioned oil continues,” Bondi said in an X post.

A still image from footage of the seizure of the Skipper posted on social media by US Attorney-General Pam Bondi.

A still image from footage of the seizure of the Skipper posted on social media by US Attorney-General Pam Bondi.Credit: AP

According to ship-tracking site Marine Traffic, the Skipper is 332.9 metres long and sails under the flag of Guyana. The vessel is classed as a “very large crude carrier”, capable of transporting up to 320,000 deadweight tonnes of oil.

Latest positional data showed the ship about 100 kilometres off the coast of Venezuela, but a New York Times analysis of satellite imagery and photographs suggested it may have tried to conceal its whereabouts by broadcasting falsified location data.

Although the vessel’s location transponder suggested it was anchored in the Atlantic Ocean near Guyana and Suriname, the Times found that from late October to at least December 4, the tanker was actually hundreds of kilometres away off the coast of Venezuela.

Formerly named Adisa, the vessel was sanctioned by the US in 2022 over accusations of belonging to a sophisticated network of “ghost tankers” that smuggled crude oil on behalf of Iran’s Revolutionary Guard and Lebanon’s Hezbollah militant group.

Data provided by TankerTrackers.com shows multiple trips to Iran and Venezuela over the last two years.

Venezuela has the world’s largest proven oil reserves, and its economy relies on oil production of about 1 million barrels a day.

Locked out of global oil markets by US sanctions, the state-owned oil company sells most of its output at a steep discount to refiners in China via a complex network of shadowy intermediaries, many of which are shell companies registered in jurisdictions known for secrecy.

Venezuelan President Nicolas Maduro speaks to supporters at an event commemorating the Battle of Santa Isabel on Wednesday.

Venezuelan President Nicolas Maduro speaks to supporters at an event commemorating the Battle of Santa Isabel on Wednesday.Credit: AP

The buyers deploy ghost tankers that hide their location and hand off their valuable cargoes in the middle of the ocean before they reach their final destination.

A day earlier, the US military flew a pair of fighter jets over the Gulf of Venezuela in what appeared to be the closest that warplanes had come to the South American country’s airspace since the start of the administration’s pressure campaign.

Washington has built up the largest military presence in the region in decades, and Trump has said land attacks are coming soon, but has not offered any details on location.

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Among the concessions the US has made to Maduro during past negotiations was approval for oil giant Chevron to resume pumping and exporting Venezuelan oil. The corporation’s activities in the South American country provided a financial lifeline to Maduro’s government.

Speaking at a rally on Wednesday, Maduro said anyone who wants Venezuelan oil must respect the law and that Venezuela would never again be an “oil colony”, the BBC reported.

Channelling the 1988 Bobby McFerrin hit, Maduro also addressed “American citizens who are against the war”, telling them “don’t worry, be happy”.

“Not war, be happy. Not, not crazy war, not, be happy.” The BBC said it was unclear whether Maduro knew of the tanker’s seizure before the rally.

During a November phone call between the two leaders, Trump reportedly offered Maduro and his family safe passage out of Caracas if he relinquished power immediately.

But Washington was unwilling to agree to Maduro’s demands, which included legal amnesty and the removal of US sanctions for him and over 100 Venezuelan officials.

Oil futures rose following news of the tanker seizure. After trading in negative territory, Brent crude futures rose US27¢, or 0.4 per cent, to settle at $US62.21 ($93.70) a barrel, while US West Texas Intermediate crude futures gained US21¢, also 0.4 per cent, to close at $US58.46 per barrel.

Venezuelan Nobel winner misses ceremony

In a separate development, Venezuela’s opposition leader Maria Corina Machado appeared in public for the first time in almost a year after missing the ceremony in Norway in which she was to receive this year’s Nobel Peace Prize.

Machado waved to supporters at a hotel in Oslo hours after her daughter accepted the award on her behalf in a ceremony that became a rally for democracy and an indictment of Venezuela’s government.

Maria Corina Machado waves at the Grand Hotel in Oslo.

Maria Corina Machado waves at the Grand Hotel in Oslo.Credit: AP

In an audio recording of a phone call published on the Nobel website ahead of the event, Machado explained she would be delayed and expressed gratitude to the many people who had “risked their lives” for her to travel to Norway.

Machado had been in hiding since January 9, when she was briefly detained after joining supporters in an anti-Maduro protest in Caracas, Venezuela’s capital.