At least three United States soldiers were injured after an Afghan soldier allegedly opened fire on USA troops Saturday in Dehdadi district in Balkh province.
A member of the 43rd Georgian Light Infantry Battalion moves into position during a June 10, 2015, joint force protection mission with US forces outside Bagram Air Field in central Afghanistan.
One Afghan soldier was killed, he said.
An investigation has been launched into the incident, he added but did not detail the incident.
Abdul Qahar Aram, spokesman for the corps, told Anadolu Agency that the wounded troops had been taken to hospital.
The gunman - an Afghan - had been shot and killed, the spokesman said.
It comes as Washington is expected to announce an increase in the USA military deployment in the country to bolster Afghan forces who are struggling to contain the Taliban's nationwide offensive. In a statement, Taliban spokesman Zabihullah Mujahid said an Afghan commando loyal to the militant group had opened fire on foreign "invaders", killing four and wounding four others.
The attack was reportedly by an afghan Soldier and it is termed as a insider act.
So far this year, six US service members have been killed in combat in Afghanistan, all in Nangarhar in the eastern part of the country, according to statistics compiled by the website icasualties.org.
More than US 2,000 troops have died from both combat and noncombat causes in the country since 2001. This is the second insider attack in a week.
USA soldiers were shot and wounded in a potential insider attack a base in northern Afghanistan, officials said.
Green-on-blue attacks have been a major problem during NATO's long years fighting alongside Afghan forces.
US President Donald Trump is learned to have delegated authority on the number of troops in Afghanistan to Defense Secretary Jim Mattis.
After more than 15 years of war the Taliban control broad swathes of the country and the struggling Afghan security forces continue to take an nearly unsustainable amount of causalities as they battle to hold provincial capitals.