**A Nato aircraft has crashed in southern Afghanistan, Nato officials say.**Taliban and Afghan officials in the province of Zabul said a helicopter had been shot down near the provincial capital, Qalat, AP reported.
Nato said it was investigating, but had no further details on the nature of the incident, nor possible casualties.
Afghan and Nato troops have been involved in an offensive against the Taliban in the southern province of Helmand since February.
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