Alwaght- A soldier of the Afghan National Army forces opened fire on US troops in Helmand injuring three.
A Sunday statement by the NATO military alliance said, “3 US soldiers wounded when shot by Afghan soldier on a base in Helmand Province.”
Omar Zwak, the provincial governor's spokesman, said an Afghan soldier was also killed in the shootout.
The assault, which highlights long-simmering tensions between Afghan and foreign forces, is the first "insider attack" on US-led forces this year.
The so-called insider attacks, when enraged Afghan soldiers and police turn their guns on US-led troops, have created mistrust between local forces and their US-led partners during the more than 15 years of war.
Currently 8,400 US troops are stationed in different bases in Afghanistan. US General Joseph Votel, who is in charge of military operations in the West Asia region, has asked for even more troops to be deployed to Afghanistan.
Under the pretext of pursuing al-Qaeda terrorists implicated in the 9/11 attacks on US soil, American forces invaded Afghanistan in 2001. The protracted military operation has caused heavy civilian casualties.