The Afghan military says a man in an Afghan uniform opened fire on a group of Americans at a base in the south of the country, killing one US soldier and wounding another.
Spokesman Gen. Mohammad Zahir Azimi says the gunman was also killed in the shootout on Sunday. He said an investigation is trying to determine whether the gunman was a member of the Afghan military.
A NATO statement late Sunday said only that a coalition service member had been killed in the incident, apparently by an Afghan soldier, but provided no further details on the victim's nationality.
Azimi said the shooting occurred inside one of the Afghan National Army's bases in Zabul province, about 250 miles (400 kilometers) south of Kabul.