An Iranian tanker headed through the Mediterranean toward Greece on Monday after it was released from detention off Gibraltar, and Tehran said that any at U.S. move to seize the vessel again would have “heavy consequences”.

The Grace 1, renamed the Adrian Darya 1, left anchorage off Gibraltar about 11 p.m. (2100 GMT) on Sunday. Refinitiv ship tracking data showed early on Monday that the vessel was heading to Kalamata in Greece.

The seizure of the tanker by British Royal Marines near Gibraltar in July 4th on suspicion it was carrying oil to Syria in violation of European Union sanctions led to a weeks-long stand-off between Tehran and the West. It also heightened tensions on international oil shipping routes through the Gulf.

Gibraltar, a British overseas territory, lifted the detention order on Thursday but the next day a federal court in Washington issued a warrant for the seizure of the tanker, the oil it carries and nearly $1 million.

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