The global shipping industry is grappling with how best to police the Strait of Hormuz as it braces for the threat of further disruptions to tankers passing through one of the world’s most important oil trading waterways.

Shipping operators’ concerns were heightened after Iran seized a British-flagged tanker in the area on Friday. A third of the world’s seaborne oil—almost 17 MMBbl/d—passes through the strait, which narrows to just 21 miles and has long been a strategic chokepoint in the oil-rich Gulf.

The seizure of the Stena Impero, which was bound for Saudi Arabia, underlined the vulnerability of vessels passing through the region and how the oil and gas shipping industry is being drawn into the stand-off between the west and Iran.

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