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Iraq crisis: How does unrest affect oil price?

18 June 2014 Last updated at 12:40 BST

The attack on Iraq's biggest oil refinery is being watched closely by financial markets.

The oil refinery near Baiji provides a quarter of the country's capacity and has the fifth largest reserves in the world.

Aaron Heslehurst explains how the latest crisis in Iraq could affect the world's oil markets.

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