No fewer than 12 Afghan soldiers on Tuesday died in the hands of their colleagues while sleeping in an outpost near the northern city of Kunduz.
The outpost was among many forming a protective ring around Kunduz, which was briefly captured by the Taliban a year ago.
It was the first time the movement had seized a provincial capital since losing power in 2001.
A senior police commander in Kunduz, Sher Aziz Kamawal, confirmed to Reuters that the killings were carried out by two soldiers suspected to have links with the Taliban.
This is the latest “insider attack” in the country.
The soldiers were said to have fled and joined the insurgents after carrying out the attack overnight.
Insider attacks have plagued both Afghan and international military forces in the country, thereby undermining trust and morale.
The Western-trained and backed Afghan government forces are battling various insurgent groups, including the Taliban.
The Taliban are fighting to expel foreign troops and re-establish a fundamentalist Muslim regime.