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If ever there was an example of where the international effort in Afganistan isn't working, it came this week.[cnn-photo-caption image=http://i2.cdn.turner.com/cnn/2009/images/11/04/art.afghanistan.afp.gi.jpg caption="British soldiers mentor Afghan police. But has the risk become too great?"]
Five British soldiers were killed by an Afghan policeman they had been training. It came as no surprise that the Taliban claimed to have infiltrated the police and carried out the attack, but it was still a major dent in confidence of British forces who believe they are making a difference.
Kim Howells, a former Foreign Office minister with responsibility for Afghanistan, said the killings strengthened the case for bringing British troops home early.
The current UK government responded by saying forces will only be withdrawn once the Afghans have been given the training and support they need to protect the country themselves.
But, given possible infiltration, should the training continue despite the risk to more foreign soldiers' lives?