MADRID — The United States moved on Thursday to halt the release of an Iranian supertanker detained in Gibraltar for breaching EU sanctions on oil shipments to Syria, thwarting efforts by authorities in London and the British overseas territory to defuse tensions with Tehran.

The Gibraltar government confirmed earlier media reports that the U.S. Justice Department seeks to extend the detention of the oil tanker Grace 1, prompting the Supreme Court in the territory to adjourn a scheduled decision on whether to release the ship until later in the day.

"The U.S. Department of Justice has applied to seize the Grace 1 on a number of allegations, which are now being considered," the Gibraltar government said in a statement, adding the matter would be reviewed by the court at 4 p.m.

The Justice Department did not immediately respond to a request for comment.

A view of the Grace 1 supertanker on Thursday. (Marcos Moreno/AP)

Britain’s Foreign Office said in a statement that the “investigations conducted around the Grace 1 are a matter for the government of Gibraltar” and that it couldn’t comment further.

Prime Minister Boris Johnson's Downing Street office said Iran was discussed during the U.K. leader's meeting with President Donald Trump's national security adviser John Bolton earlier in the week, though no details were released on the talks.

While there was no immediate reaction from Tehran, the U.S. move likely will further stir tensions in the Persian Gulf.

The Grace 1, carrying 2.1 million barrels of Iranian crude, was seized last month in a British Royal Navy operation off Gibraltar. The vessel was suspected of violating European Union sanctions on oil shipments to Syria, and its seizure deepened tensions in the Persian Gulf. Iran called the seizure by Gibraltar an “act of piracy.”

Shortly after the detention of the Grace 1, Iran seized the British-flagged oil tanker Stena Impero, which remains held by the Islamic Republic. Analysts had hoped the release of the Grace 1 by Gibraltar would see the Stena Impero similarly released.

In past weeks, the Persian Gulf region has seen six attacks on oil tankers that the U.S. has blamed on Iran and the downing of a U.S. surveillance drone by Iranian forces. Iran has denied being behind the tanker attacks.

Iran also has seized other oil tankers.

Attorney General for Gibraltar Michael Llamas, left, arrives at the court in the British territory of Gibraltar on Thursday. (Marcos Moreno/AP)

The Gibraltar government had said it was seeking to “de-escalate” the situation over the Grace 1.

Signaling preparations for the expected release of the ship, the captain, an Indian national, and three officers of the Grace 1 were released from detention Thursday, the government said.

The whereabouts of the released crew, none of whom are Iranian, were not immediately known. The crew of the Grace 1 includes sailors from India, Pakistan and Ukraine, according to Iranian state television.

As speculation mounted over the Grace 1's release, a lawyer representing the territory's General Attorney Michael Llamas announced during a Thursday morning hearing at the Gibraltar Supreme Court that the U.S. had moved at the eleventh hour.

Speaking in court, Chief Justice Anthony Dudley said that were it not for the U.S. move, "the ship would have sailed," the Gibraltar Chronicle reported.

This is the second time the Trump administration has moved to seize a ship in recent months. In May, the Justice Department announced that it had seized a North Korean cargo ship used to supply coal to the isolated nation in violation of international sanctions.

Tensions have escalated in the Persian Gulf region since Trump over a year ago unilaterally withdrew the U.S. from Iran's 2015 nuclear deal with world powers. The decision stopped billions of dollars' worth of business deals, largely halted the sale of Iran's crude oil internationally and sharply depreciated Iran's currency, the rial.

In recent weeks, Iran has begun to step away from the nuclear deal by increasing its production and enrichment of uranium. It has threatened to take further steps in early September if Europe can't help it sell its oil abroad.

Lina Khatib, head of the Middle East and North Africa program at Chatham House, said the U.S. request on the Grace 1 was based on its own imposed sanctions on Iran, and not the EU's sanctions on oil exports to Syria.

"Although the U.S. expects its European allies to abide by these sanctions, it is up to the Gibraltar authorities to assess the allegations presented by the U.S.," Khatib said. "The Gibraltar court could decide to hand over custody of the ship to the U.S., which would give the U.K. a much needed get-out clause from the tension caused by the ship's seizure."

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Resolving the tanker dispute would help Prime Minister Johnson focus on domestic issues as he works to complete Britain’s exit from the European Union and prepare for anticipated national elections over the next few months.

Dryad Global, a U.K.-based maritime security consultant, earlier this week suggested the Grace 1 would soon be released, citing Britain's domestic politics. But while a resolution to the tanker dispute could ease the situation at home, it may increase tensions with the U.S., Britain's most important international ally.

The U.S. has been asking its allies to take part in a naval mission to protect shipping in the strategic Strait of Hormuz, at the mouth of the Persian Gulf, though European nations have been reluctant.

Britain has so far been the only one to express willingness to join a maritime security mission. It has also been giving U.K.-flagged vessels a naval escort since the Iranian Revolutionary Guard's seizure of the Stena Impero in the Gulf.

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Gambrell reported from Dubai, United Arab Emirates. Associated Press writers Jill Lawless and Danica Kirka in London, Eric Tucker in Washington and Amir Vahdat in Tehran, Iran, contributed to this report.

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