Nine members of the Nato-led International Security Assistance Force have been killed in a helicopter crash in southern Afghanistan, officials say.
Two Nato troops, an Afghan soldier and a US civilian were also injured, an Isaf statement said. The nationalities of the Nato troops are not known.
It is not yet clear what caused the crash, but Isaf said there was no enemy fire where the aircraft came down.
At least 529 foreign troops have been killed so far this year in Afghanistan.
The toll makes 2010 the deadliest year since the US-led invasion in 2001, according to figures collated by the website iCasualties.
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