However the Taliban immediately claimed responsibility for the deaths, using their main Twitter account to report that their fighters had shot down the US helicopter in the southern province of Zabul.
The incident was the single biggest loss of life for the NATO mission in Afghanistan since seven Georgian soldiers died when a suicide bomber blew up a truck loaded with explosives outside a base in Helmand province in June.
"Six International Security Assistance Force (ISAF) service members died following an aircraft crash in southern Afghanistan today," an ISAF statement said.
US defence officials in Washington told AFP that the fatalities were US troops.
"I can confirm six Americans were killed," said one official, who spoke on condition of anonymity.
An investigation was underway to determine "the cause of engine failure," the official said.
The Taliban Twitter account, under the name Abdulqahar Balkhi, said the helicopter was brought down today afternoon while flying low over the district of Shah Joy in Zabul.
"(The) chopper crashed in (a) ball of flame... Killing all 8 invaders aboard," the account said.
Provincial officials confirmed the incident in Zabul, a restive province bordering on Helmand and neighbouring Pakistan.
"I can confirm a helicopter crashed in Shah Joy district this afternoon but we don't have any information about the casualties or the cause of the hard landing," Mohammad Jan Rasolyar, deputy governor of Zabul province, told AFP.
You’ve reached your limit of {{free_limit}} free articles this month.
Subscribe now for unlimited access.
Already subscribed? Log in
Subscribe to read the full story →
Smart Quarterly
₹900
3 Months
₹300/Month
Smart Essential
₹2,700
1 Year
₹225/Month
Super Saver
₹3,900
2 Years
₹162/Month
Renews automatically, cancel anytime
Here’s what’s included in our digital subscription plans
Exclusive premium stories online
Over 30 premium stories daily, handpicked by our editors


Complimentary Access to The New York Times
News, Games, Cooking, Audio, Wirecutter & The Athletic
Business Standard Epaper
Digital replica of our daily newspaper — with options to read, save, and share


Curated Newsletters
Insights on markets, finance, politics, tech, and more delivered to your inbox
Market Analysis & Investment Insights
In-depth market analysis & insights with access to The Smart Investor


Archives
Repository of articles and publications dating back to 1997
Ad-free Reading
Uninterrupted reading experience with no advertisements


Seamless Access Across All Devices
Access Business Standard across devices — mobile, tablet, or PC, via web or app
