Afghan officials say at least 10 Afghan Army troops have been killed in what they described as an "insider attack" in the country's north.
Local officials in Jawzjan Province said the attack occurred before dawn on September 22 after a fellow soldier allowed insurgents inside a checkpoint.
Officials said the soldier and an unspecified number of attackers were all killed in an ensuing shootout with Afghan troops.
No group immediately claimed responsibility for the attack.
So-called insider attacks, carried out by an Afghan soldier or policeman turning on fellow troops, have been a serious problem in recent years.
Jawzjan Province -- which borders Turkmenistan -- has largely been spared the worst of the violence from the Taliban insurgency.
But some of its districts --including Qush Tepa where the attack took place -- have witnessed a rising Taliban presence.