High-ranking British officers in Afghanistan say they need more air power to assist ground troops, who are facing increasing violence.

The calls come after a week of intense clashes with Taleban fighters in the southern province of Helmand.

Sources have told the BBC that more transport and attack helicopters and medical evacuation planes are needed.

The British military has about 4,000 troops in Afghanistan. They are part of a Nato-led taskforce.

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