Shahjoi District, Afghanistan (CBS News) -- Eight US service personnel were killed and 14 wounded when a military helicopter crashed on Sunday in southeastern Afghanistan after reporting engine failure, the US military said.
The CH-47 Chinook helicopter was carrying 22 US service personnel when there was a sudden and unexplained loss of power and control and the helicopter crashed, according to US military spokesman Lieutenant Colonel David Accetta.
The helicopter crashed in the Shahjoi district of Zabul province, about 50 metres (160 feet) from the main highway between Kabul and Kandahar, and appeared to be destroyed and scattered in several pieces.
Col. Tom Collins, spokesman for the NATO's International Security Assistance Force, said he was confident the helicopter had not been brought down by enemy action.
A U.S. Military statement said details of the incident would not be released until "completion of recovery operations."
Coalition and NATO forces have lost several helicopters in Afghanistan in the last few years but only one is thought to have been shot down.
Thousands of US forces are deployed in southeastern Afghanistan.