Is Iran unwittingly sending supplies to American forces in neighbouring Afghanistan which may in future be used against it? That fear lies behind Iran's recent decision to block the trans-shipments of fuel to its landlocked neighbour, causing shortages and price rises, and leading Afghanistan's chamber of commerce to threaten a trade embargo. The Afghan government, and the nato forces it hosts, insist that the petrol and diesel in question serves civilians alone. But Iran thinks it no coincidence that trans-shipments more than doubled in 2010, when America launched its "surge" against the Taliban.
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