Nine foreign troops have been killed in a helicopter crash in Afghanistan's south, the International Security Assistance Force [Isaf] has said.
Four others were also injured in Tuesday's crash, including two Nato troops, an Afghan soldier and a US civilian.
"The cause of the crash is under investigation," Isaf said.
"There are no reports of enemy fire in the area."
The injured had been taken to an Isaf medical facility, the statement said.
It gave no details on the nationalities of those killed or the exact location of the crash.
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 the monitoring website iCasualties.org.
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Map of Afghanistan
Al-Jazeera