A U.S. service member was shot to death Tuesday on a base in western Afghanistan, officials said.

NATO offered no other details, but Afghan Gen. Jalander Shah Bahnam said an Afghan soldier opened fire Tuesday after NATO troops tried to prevent him from approaching an area where an allied helicopter was about to land. He said the American service member died and two Italian soldiers were injured.

Bahnam, the corps commander for the Afghan National Army's western region, said the NATO troops returned fire, injuring the Afghan soldier.

He said the incident happened at a military base in the Bala Murghab district of Badghis province.

Pentagon officials said they have "heard these reports" from their representatives in Afghanistan, but could not immediately confirm.

Fox News' Justin Fishel and The Associated Press contributed to this report.