A picture shows supertanker Grace 1 off the coast of Gibraltar on July 6, 2019. Iran demanded on July 5, 2019 that Britain immediately release an oil tanker it has detained in Gibraltar, accusing it of acting at the bidding of the United States. Authorities in Gibraltar, a British overseas territory on Spain's southern tip at the western entrance to the Mediterranean, said they suspected the tanker was carrying crude to Syria in violation of EU sanctions. / AFP / JORGE GUERRERO
The Iranian supertanker Grace 1, which was seized by the UK's Royal Marines off the coast of Gibraltar sailed under the Panamanian flag. AFP

Quicktake: What are 'flags of convenience'?




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