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Military strategy to push back Islamist fighters

US air strikes have continued with a drone targeting an Islamic State mortar near Kurdish troops, the Pentagon has said.

It said the aim was to protect Kurdish forces who had been trying to rescue fleeing Yazidi refugees.

Over the weekend, Kurdish forces managed to win back the town of Makhmur, near Irbil.

Paul Wood reports on the military strategy to push back the Islamist fighters.

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