Libyan rebels retreating in the Nafusa mountains
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Libyan rebels face counter attack from Gaddafi's forces

Colonel Gaddafi's forces have begun a counter attack in western Libya, against rebels who have been fighting hard to advance towards the capital of Tripoli.

Civilians in the area have already fled their homes as the front line of the conflict moves back and forth in the Nafusa mountains.

Paul Wood reports from Gualish, a village caught in the crossfire.

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