One U.S. service member was killed and two others wounded Saturday in an apparent "insider attack" in southern Afghanistan, making it the first attack of its kind on U.S. personnel this year.
The ambush occurred in southern Afghanistan, U.S. military officials said in a statement without being more specific.
The two wounded servicemembers are being treated and are in stable condition, the mission said in a statement.
The incident marks the first combat fatality for the USA military in Afghanistan since April 30, and the second there this year.
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North Atlantic Treaty Organisation said the wounded service members are in stable condition. There were no insider attacks on US service members during the same period, according to a Department of Defense (DoD) report released last month.
An insider attack would indicate one carried out by a member of the Afghan security forces.
Around 14,000 USA troops are now stationed in Afghanistan as part of the NATO-led mission, while also carrying out counterterrorism operations targeting Islamic State (IS) militants and Al-Qaeda. The Afghan province that has seen the highest number of attacks is Helmand to the south, a Taliban stronghold and the heart of Afghanistan's opium-growing industry.
The service branch of the troops and the province in which the suspected attack occurred have not been made public. The last insider attack that resulted in a USA casualty occurred two months earlier, in June of a year ago.