The target was a US convoy passing through an eastern neighbourhood of Kabul. This is the second suicide attack in the capital in as many days.
Images of Taliban fighters acquiring enemy weaponry have been shared on social media and the fact is that the Taliban gets its arms from different sources for years. But what impact does this have on the war.
The provincial governor's office said 16 other troops were wounded in the attack that began Friday and continued into Saturday in Wahser district.
Another seven soldiers were wounded in the siege in Sari Pul province, which the local government pinned on the Taliban.
Afghan officials said US special forces units were on the ground helping to coordinate air strikes and ground operations as reports emerged that more than 300 killed on both sides, including over 100 government forces and 20 civilians.
Abdul Aziz Beg, head of the provincial council in Badghis province, says the Taliban struck Afghan army positions from different directions. There are conflicting reports over the Taliban's claim.
The unidentified gunman, who was later killed, opened fire while the Americans were at the gate of an Afghan military ammunition supply depot near Camp Moreshead outside Kabul.
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