The Taliban infiltrator then stole their weapons and fled the police outpost in the Chinarto district of volatile Uruzgan province, authorities said.
“Our investigation shows that this policeman collaborated with the Taliban, drugged his colleagues and killed them when they were unconscious,” Dost Mohammad Nayab, the spokesman for Uruzgan’s governor, told AFP.
Deputy provincial police chief Rahimullah Khan confirmed the account and said an operation had been launched to track down the killer.
Taliban spokesman Zabihullah Mujahid, giving a different account, said nine policemen were killed after the militants captured the police outpost in Chinarto.
So-called insider attacks — when Afghan soldiers or police turn their guns on their colleagues or international troops — have been a major problem during NATO’s long years fighting alongside Afghan forces.
On January 17 nine Afghan policemen were shot dead in Uruzgan by four rogue colleagues said to be Taliban infiltrators.