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On Thursday, three Iranian vessels tried to block a British tanker passing through Hormuz.
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Iran responded by seizing a British tanker.
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On Monday oil prices rose about 1% after Iran seized a British tanker late last week.
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Last week Iran captured a British tanker after Britain's Royal Marines seized an Iranian tanker on July 4.
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Brent crude prices LCOc1 moved higher on worries that Iran's seizure of a British tanker last week could lead to supply disruptions.
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In July, Iranian forces seized a British tanker in the Gulf after British marines captured an Iranian vessel in the Strait of Gibraltar.
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The Iranian vessels only turned away after the UK naval frigate HMS Montrose intervened, positioning itself between the ships and the British tanker.
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The seizure of the British tanker in the world's most important waterway for the oil trade has deepened a crisis between Iran and the West.