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Drilling at a shale site in southern England has been suspended because of a planned six-day protest against fracking.

Caudrilla Resources said Friday operations in West Sussex were on hold.

Fracking uses high-pressure water, sand and chemical injection to extract oil from layered rock formations.

At least a thousand additional protesters were expected in the village of Balcombe in West Sussex this weekend, according to police.

Prime Minister David Cameron supports fracking, he said Monday.

Opponents say it triggers small earthquakes and contributes to water pollution.

UK-based Cuadrilla said it plans to restart operations as soon as it is safe.