A British Royal Navy patrol vessel guards the oil supertanker Grace 1, that's on suspicion of carrying Iranian crude oil to Syria, as it sits anchored in waters of the British overseas territory of Gibraltar, historically claimed by Spain. | Jon Nazca

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Gibraltar said on Friday it had obtained an order extending the detention of the Iranian Grace I supertanker by 14 days because there were grounds to believe it was breaking sanctions by taking oil to Syria.

"The Supreme Court has issued today's order on the basis that there are reasonable grounds to consider that the detention of the Grace 1 is required for the purposes of compliance with the EU Regulation 36/2012 on sanctions on Syria," the government of the British overseas territory on the southern tip of Spain said in a statement.