Isaf's Brigadier General Josef Blotz has said the suicide car bomb attack which killed and injured Nato soldiers and Afghan civilians in Kabul was not "a preventable incident".
He told the BBC a "determined suicide bomber... is very hard to prevent".
He added he believed the Afghans, responsible for security in Kabul since the end of 2008, were "able to live up to their mission", saying there had not been such an incident "for a long time".
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