Resolute Support, the NATO-led mission to Afghanistan, announced three US service members were killed by an improvised explosive device on Tuesday.
Nato's Resolute Support mission would not immediately release any details about the soldiers, but said they had been killed when an improvised explosive device (IED) detonated near Ghazni city in central Afghanistan.
Lt. Ubon Mendie, a spokesman for the US forces, said in a statement that three other service members and one American civilian contractor were injured in the blast. The condition of the wounded was not known, but they are receiving medial care.
The estimated 14,000 US troops in Afghanistan are "doing the advising in the field" for the Afghan forces, Mattis said. There are also several thousand U.S. Special Forces conducting counterterrorism missions.
USA military officials said the attack Tuesday took place during a military patrol near Ghazni city, which has remained tense and unstable since Taliban forces overran it in August in a four-day siege that left more than 100 people dead and parts of the city in ruins. The two districts, which are predominantly comprised of Hazara populations, were considered to be the most secure rural districts in all of the country. "It gives you an idea just how much of a load of this fight is being carried by the Afghan army", he said.
Jasso was apparently hit "when the partnered force became engaged in a close-quarter battle during an assault on one of multiple barricaded al-Qaeda shooters".
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US envoy Zalmay Khalilzad is spearheading efforts to strike a peace deal with the Taliban before Afghanistan's presidential election, scheduled for April next year.
"Sgt. Jasso was killed defending our nation, fighting al Qaeda alongside our Afghan partners", Miller added.
On Saturday, a USA soldier was killed in Nimroz province in what appeared to be an accidental shooting, the Nato-led mission also announced on Tuesday. Brent Taylor was shot dead in an insider attack in Kabul.
The number of American casualties has fallen dramatically since the end of 2014 when Afghan forces took over from US-led North Atlantic Treaty Organisation combat troops to secure the country.
The deaths bring to 13 the number of USA troops killed in the country in 2018.