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UK troops take Taleban stronghold
British troops in Afghanistan have undertaken their biggest operation since the fall of the Taleban in 2001.
Three hundred soldiers - backed by hundreds of American and Canadian troops - have taken control of Sangin in the southern province of Helmand.
Six British troops have been killed in or near the town in recent weeks.
Military chiefs earlier defended their decision to call in US planes to drop 500lb bombs on Taleban fighters in the nearby town of Nawzad.
Afghan president Hamid Karzai has ordered an investigation into the circumstances surrounding the Sangin fighting, which has left 10 Taleban dead.
Apache helicopters led the way early on Saturday for Chinooks which dropped the British troops on the ground - much of the fighting force of 3 Para battle group.
They were backed up by a further 700 coalition troops.
They sealed off the town and targeted a number of compounds which are being searched.
Captain Drew Gibson, spokesman for British forces in Helmand, said the situation was "all quiet" as night fell, but the large contingent remained in the area.
A Ministry of Defence spokeswoman said it was an ongoing 'cordon and search' operation.