Elite Coast Guard squad and 'dark fleet' ship - what we know about US seizure of oil tanker

A US helicopter flies low over a hazy blue sea as it approaches a massive ship. It hovers as camouflaged soldiers holding rifles swing down ropes to the vessel's deck.

The video, released by the US government, shows the latest in a series of escalations in Washington's pressure campaign on Nicolás Maduro's government – the seizure of a crude oil tanker.

The US claims the tanker is used to transport sanctioned oil from Venezuela and Iran in an "illicit oil shipping network supporting foreign terrorist organizations".

Venezuelan Foreign Minister Yvan Gil has called the seizure "international piracy" and claims US President Donald Trump wants Venezuela's energy resources.

Here's what we know.

"We have just seized a tanker on the coast of Venezuela - a large tanker, very large, the largest one ever seized actually," Trump told reporters at the White House on Wednesday.

The footage of the operation was shared by Attorney General Pam Bondi on social media. Bondi said a seizure warrant for the tanker was carried out by the US Coast Guard, FBI, Homeland Security Investigations and the Department of Defence.

The exact location of the tanker at the time of the seizure is not clear, but a senior military official told BBC's US partner CBS News that the vessel had just left a port in Venezuela.

The 45-second video shows a US team walking the deck of the ship with their weapons drawn. No ship crew are visible.

The seizure involved two helicopters, 10 marines and 10 US Coast Guard members, and special operations forces, a source familiar with the operation told CBS.

The boarding of the vessel involved an elite group of the Coast Guard called the Maritime Security and Response Team, the source said.

This team is trained in counterterrorism and high-risk law enforcement boarding procedures – like the fast-rope boarding from a helicopter seen in the video. It was created after the September 11 attacks, during an overhaul of national security.

The Coast Guard led the operation with support from the Navy, officials told CBS.

Maritime risk company Vanguard Tech identified the vessel as the Skipper and said it believed the ship had been "spoofing" its position - or broadcasting a false location - for a long time.

The ship has sailed under other names, including Toyo and Adisa, since it was built 20 years ago. The Skipper is 333m (1,092 ft) in length and 60m wide, and is classified as a very large crude carrier (VLCC).

Vanguard Tech said the vessel is "reported to be part of the dark fleet, and was sanctioned by the United States for carrying Venezuelan oil exports". The dark fleet refers to ships used to smuggle sanctioned goods.

It is believed to have left the oil port of Jose on either 4 or 5 December, with about 1.8 million barrels of heavy crude oil on board, with about 200,000 barrels transferred to another vessel before the seizure, Reuters reported, citing analysis from TankerTrackers.com and the Venezuelan state oil company PDVSA.

The US treasury department sanctioned the Skipper in 2022, CBS reported, for alleged involvement in oil smuggling that generated revenue for the Hezbollah group in Lebanon and the Islamic Revolutionary Guard Corps-Quds Force in Iran.

BBC Verify located the tanker on MarineTraffic, which shows that the vessel was sailing under the flag of Guyana when its position was last updated two days prior to the seizure. A statement from Guyana's Maritime Administration Department on Wednesday evening, however, said that the Skipper was "falsely flying the Guyana Flag as it is not registered in Guyana".

MarineTraffic shows it was last near Iran in mid-September before arriving off the coast of Guyana at the end of October and making minimal further movement since then. This data may be partial or incorrect because of spoofing.

When asked by reporters what the US would do with the oil carried by the tanker, Trump said: "We keep it, I guess... I assume we're going to keep the oil."

Global crude oil prices are trading at roughly $61 (£46) a barrel, meaning the stash aboard the skipper could be worth more than $95m - if it does indeed comprise 1.6m barrels after 200,000 were removed. The BBC has not verified how much oil is on board the ship.

Bondi, the top prosecutor in the US, said of the seized vessel: "For multiple years, the oil tanker has been sanctioned by the United States due to its involvement in an illicit oil shipping network supporting foreign terrorist organizations."

Maduro has accused the US of using its ongoing military buildup in the Caribbean and "war on drugs" to try and depose him and get its hands on Venezuela's oil - something the US denies.

Venezuela sits on largest known reserves of crude oil in the world. But Analysts have highlighted the complexities. The oil considered "heavy" and highly viscous, meaning that extracting it needs special equipment and knowledge.

Venezuela's ageing infrastructure and heavy sanctions from the US have also caused difficulties for the nation's efforts to monetise its vast resources.

The Trump administration has focused for much of the last year on fighting the influx of drugs - especially fentanyl and cocaine - into the US.

As part of the effort, Trump designated two Venezuelan criminal groups - Tren de Aragua and Cartel de los Soles - as Foreign Terrorist Organisations and has alleged that the latter is led by Maduro himself.

Without providing evidence, Trump has also accused Maduro of "emptying his prisons and insane asylums" and "forcing" its inmates to migrate to the US. Stopping immigration has been another priority for the White House.

As part of the pressure campaign, the US has deployed 15,000 troops and a range of aircraft carriers, guided-missile destroyers, and amphibious assault ships to the Caribbean. Among them is the world's largest warship - the USS Gerald Ford - from which helicopters took off as part of the tanker seizure.

Since early September, US forces have carried out more than 20 strikes in international waters on boats alleged to have been carrying drugs. More than 80 people have been killed.

The Trump administration argues that it is involved in a non-international armed conflict with the alleged drug traffickers, whom it accuses of conducting irregular warfare against the US.

The US has also described those on board as "narco terrorists" but legal experts say the strikes are unlawful as that designation "did not transform them into lawful military targets".