"Three US service members were killed and three wounded when an improvised explosive device detonated November 27 near Ghazni city". Jasso was wounded by small-arms fire and was treated and evacuated to the nearest medical treatment facility, where he died, NATO's Resolute Support mission said Tuesday.
The Taliban, which control large parts of Ghazni province, claimed responsibility for the attack, which also wounded an American civilian contractor. Attack helicopters flew in to support the evacuation of the wounded.
No other details have been released.
The deaths are the latest in a growing toll on US forces in Afghanistan following the death of an army Ranger following an operation against al Qaeda militants in Nimruz province on Saturday. There are also several thousand U.S. Special Forces conducting counterterrorism missions. "It gives you an idea just how much of a load of this fight is being carried by the Afghan army", he said.
The U.S. and North Atlantic Treaty Organisation formally concluded their combat mission in 2014, but still provide vital support to Afghan security forces, who have been struggling in recent years to combat a resurgent Taliban and ISIS affiliate.More news: Nooses found outside MS legislature day before Senate vote
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Resolute Support believes the soldiers was accidentally killed by an Afghan soldier in close quarters combat "during an assault on one of multiple barricaded al Qaeda shooters".
"Sgt. Jasso was killed defending our nation, fighting al Qaeda alongside our Afghan partners", Miller added.
That attack came a few days after a suicide bomber killed 55 religious scholars gathered in the Afghan capital, Kabul, to celebrate the holiday marking the birth of Islam's prophet, Muhammad. The U.S. military involvement began within weeks of the September 11, 2001, terror attacks.
The total number of US military casualties during the 17-year Afghan war has been more than 2,400.
On Saturday, a U.S. soldier was killed in Nimroz province in what appeared to be an accidental shooting, the Nato-led mission also announced on Tuesday.