How the Strait of Hormuz, the skinny waterway for a third of all crude oil, has become a security risk that could affect oil prices.

The Strait of Hormuz, sometimes described as the world's most important oil choke point, is a gateway for almost a third of all crude oil and other petroleum products carried by tanker.

But it is also an increasingly dangerous place because of recent attacks on tankers, raising fears that the route is vulnerable to assaults that could threaten and destabilise oil prices.

After the apparent attack Thursday (US time) on two tankers just outside the

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A passage just 3km wide

Few alternative routes

Jitters in the oil market