NATO's command in Afghanistan is "reviewing the circumstances" of the death three days ago of a former official in a southern Afghan province.
Haji Abraham, the former district chief of Gereshk District in Helmand province, was killed Monday.
NATO's International Security Assistance Force and Afghan troops were attempting to capture Taliban insurgents when "a joint security force" shot and killed Abraham, an ISAF statement said Thursday.
At the time, ISAF said, he "demonstrated hostile intent by brandishing a hand-grenade."
Afghan President Hamid Karzai and Helmand's governor "were briefed in detail" after the raid and the initial investigation.
There will be more information provided when the probe is complete, ISAF said.
During the operation, six men were detained and one was released, the statement said. Troops found material linking the men to "insurgent activity."
The news came on the same day that British Foreign Secretary William Hague said a British aid worker who died during a failed rescue attempt in Afghanistan was killed by a U.S. grenade.
Linda Norgrove was killed in the operation October 6. She had been kidnapped in a remote region of Afghanistan September 26.
In another development Thursday, two NATO-led troops in Afghanistan were killed, one in an insurgent attack in the south and the other by an improvised explosive device in the east.