KABUL: One US service member was killed and two others wounded in anapparent insider attack in southern Afghanistan, the NATO-led ResoluteSupport mission said on Saturday.

In a statement, the Taliban said a member of the Afghan security forcesopened fire on US troops in the southern province of Uruzgan, killing fourpeople and wounding several others.

Saturday’s incident comes just over a year after three US soldiers werekilled by an Afghan soldier in the eastern province of Nangarhar.

Insider attacks, often known as “green on blue” attacks in which Afghanservice members or attackers wearing Afghan uniforms fire on US orcoalition troops, have been a regular feature of the conflict inAfghanistan, although their frequency has diminished in recent years.

Coalition forces have also tightened security and added extra forceprotection measures including special “Guardian Angel” units to accompanytraining units.

The Resolute Support statement said the two wounded on Saturday were in astable condition and the incident was being investigated. But it gave nofurther details, saying the name of the service member killed would bewithheld until next of kin were notified.

Last year, the United States added thousands of additional troops to itsforces in Afghanistan, which are engaged in both training and advisingAfghan forces and conducting counter-terrorist missions against Daesh andother militant groups.

As in other areas of the war, Afghan units suffer more heavily thancoalition units from insider attacks.

A Pentagon report last month said there were 47 so-called “green-on-green”attacks, or incidents where Afghan soldiers turn on their own side, so farthis year.