Officials said the plane landed of its own accord in the city of Bandar Abbas after being warned that it would be intercepted if it did not.
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A Fly Dubai charter flight carrying 100 American military contractors from Afghanistan to Dubai was ordered to land in Iran. Reportedly, when the plane entered Iranian airspace, it was ordered to go back to Afghanistan, but the pilots cited lack of fuel and subsequently landed the aircraft. (via Washington Post):
A military-chartered aircraft carrying about 100 Americans from Afghanistan to Dubai landed unexpectedly in Iran on Friday, after Iranian officials questioned its flight plan and ordered it to do so, U.S. and officials in the region said.