The nine NATO troops killed in an Afghanistan helicopter crash Tuesday were American, U.S. defense officials confirmed to Fox News. One Afghan national security force member was wounded.
The crash happened in Zabul province in southern Afghanistan, where troops are ramping up pressure on Taliban insurgents. The area has rugged terrain where helicopters are heavily used to transport military troops spread over mountainous areas with few roads.
The cause was not immediately clear. The Taliban claimed to have shot down the helicopter, but NATO said there were no reports of hostile fire.
So far this year, 525 U.S. and NATO forces have been killed in Afghanistan, surpassing the 504 killed last year. This year has been the deadliest for international forces since the war began in 2001.
Mohammad Jan Rasoolyar, a spokesman for the provincial governor in Zabul, said the helicopter went down in Daychopan district.
"I was sitting taking my tea," said Nakeemullah, 20, who works transporting livestock in the area. "I heard noise and I went outside to see what happened.
"I saw a lot of smoke in the sky," said Nakeemullah, who uses only one name. "It was far away for me, but I could see that it was a helicopter and it went down on the backside of the mountain where I couldn't see."
NATO said there were no reports of enemy fire in the area. However, Taliban spokesman, Qari Yousef Ahmadi, told The Associated Press by telephone that insurgents shot down the helicopter. The Taliban often exaggerate their claims and sometimes taking credit for accidents.
Also Tuesday, NATO said Afghan and NATO forces had conducted an operation Sunday and Monday to disrupt the Taliban's freedom of movement outside its heartland of Kandahar City, also in the south, killing at least 11 insurgents and destroying several improvised explosive devices.
Most helicopter crashes in the country have been accidents caused by maintenance problems or factors such as dust.
Before this latest event, the worst helicopter crash for coalition forces was in May 2006 when a Chinook crashed attempting a nighttime landing on a small mountaintop in eastern Kunar province, killing 10 U.S. soldiers. That followed a 2005 crash in Kunar that killed 16 Americans. In February 2007, a Chinook helicopter crashed in Zabul, killing eight U.S. personnel.
The most recent helicopter crash occurred in southern Kandahar province in August when a Canadian Chinook was shot down, injuring eight Canadians.
Afghan troops have been killed in helicopter crashes as well.
In January 2009, a top Afghan Army general for the western region of Afghanistan and 12 others were killed when their MI-17 helicopter went down in Shindand district of Herat province in western Afghanistan.
Also Tuesday, five Afghan road construction workers were killed and four wounded when their vehicle hit a roadside bomb in Shinwari district of Parwan province, said Shinwari police official Abdul Shakoor. Parwan is in northeastern Afghanistan.
The violence follows a spate of attacks around the country as it held parliamentary elections on Saturday. Officials said militant attacks on election day killed at least 21 civilians and nine police officers.
Results of the elections could take weeks or even months to compile.
It was the worst chopper crash for coalition forces in four years in the rugged country where helicopters are heavily used to transport military troops spread over mountainous terrain with few roads. This year was already the deadliest for international forces since the war began in 2001.
So far this year, 525 U.S. and NATO forces have been killed in Afghanistan, surpassing the 504 killed last year.
The Associated Press contributed to this report.