KABUL, Sept. 4 (Xinhua) -- One U.S. service member of U.S.-led NATO coalition forces was killed and another wounded following an apparent insider attack in eastern Afghanistan on Monday, the coalition forces said Tuesday.

"The sacrifice of our service member, who volunteered for a mission to Afghanistan to protect his country, is a tragic loss for all who knew and all who will now never know him," General Scott Miller, commander of Resolute Support (RS) and U.S. Forces- Afghanistan, was quoted in a statement as saying.

The latest death has brought to six the number of U.S. forces killed in Afghanistan since January this year.

Additional information will be released as appropriate and the wounded soldier was in a stable condition, according to the statement.

Such incident had also happened in the past when Afghan soldiers turned their weapons against coalition forces and Taliban insurgents mostly claimed responsibility for insider attacks.

On July 7, one U.S. soldier was killed and two others wounded in a similar incident in southern Uruzgan province.

NATO and U.S. forces completed their combat mission in Afghanistan by the end of 2014, after 13 years of military presence in the country.

However, around 16,000 foreign forces remained in Afghanistan to help Afghan forces in the fields of training, advising and backing them in the war on insurgents.