Authorities in Gibraltar said they intercepted Thursday a supertanker believed to be breaching European Union sanctions by carrying a shipment of Iranian crude oil to war-ravaged Syria, while a senior Spanish official said the operation was requested by the United States.
Gibraltar port and law enforcement agencies, assisted by Britain’s Royal Marines, boarded the Grace 1 early Thursday, authorities on the British overseas territory at the tip of Spain said in a statement.
It added that the vessel was believed to be headed to the Baniyas Refinery in Syria, which is a government-owned facility under the control of Syrian President Bashar Assad and subject to the EU’s Syrian Sanctions Regime.
The EU and others have imposed sanctions on Assad’s government over its continued crackdown against civilians. They currently target 270 people and 70 entities.
Spain’s caretaker foreign minister said the tanker was stopped by British authorities after a request from the United States.
Josep Borrell told reporters in Madrid that Spain is assessing the implications of the operation because the detention took place in waters it considers its own.
Britain insists Gibraltar is part of the United Kingdom but Spain argues that it is not, and the tanker operation risks offending the Spanish.
“We’re looking into how this (operation) affects our sovereignty,” said Borrell, who was nominated earlier this week to become the EU’s foreign policy chief.
The Spanish claim that the U.S. requested the operation switched attention to whether the tanker was carrying Iranian crude.
The Gibraltar authorities didn’t confirm the origin of the ship’s cargo but Lloyd’s List, a publication specialized in maritime affairs, reported this week that the Panama-flagged large carrier was laden with Iranian oil.
Panama’s Maritime Authority said on Thursday that Grace 1 was no longer listed in Panama’s international boat registry as of May 29.
Experts were said to have concluded that it carried oil from Iran because the tanker wasn’t sending geographic information while in Iranian waters. According to a UN list, the ship is owned by the Singapore-based Grace Tankers Ltd.
According to the data firm Refinitv, the vessel likely carried just over 2 million barrels of Iranian crude oil. Tracking data showed that the tanker made a slow trip around the southern tip of Africa before reaching the Mediterranean.
The tanker’s detention comes at a particularly sensitive time as tensions between the US and Iran grow over the unraveling of a 2015 nuclear deal, which President Donald Trump withdrew from last year. Trump has also slapped sanctions onto Iran and recently approved the passage of a carrier group, bombers, and fighter jets to the Arabian Gulf.
There was no immediate reaction to the tanker’s detention from Syria, which has suffered severe fuel shortages as a result of the civil war and Western sanctions that have crippled the country’s oil industry, once the source of 20 percent of government revenues.
Iran, which has provided vital military support to Assad, extended a $3 billion credit line for oil supplies beginning in 2013 but the Iranian aid dwindled as Washington restored tough sanctions. In November, the US Treasury Department added a network of Russian and Iranian companies to its blacklist for shipping oil to Syria and warned of “significant risks” for those violating the sanctions.
Fabian Picardo, Chief Minister of Gibraltar, which has in the past been a transit port for energy shipments without known buyers, said he has informed the EU about developments.
In a statement, the British government welcomed the “firm action” by authorities in Gibraltar.