Library pictures of Baiji oil refinery in Iraq
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Iraq crisis: How does unrest affect oil price?

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.

Go to next video: Iraq's biggest oil refinery invaded