An Afghan policeman drugged and shot 10 of his comrades late Monday in the central province of Uruzgan, an official said.
"The policeman who had connections with armed militants first poisoned his comrades and than shot all of them during the night in a checkpoint located in Shpilokh area of Chinartu district," said Dost Mohammad Nayab, a spokesman for Governor of Uruzgan.
The suspect was being sought, he said.
A convoy of police heading for the checkpoint this morning repelled another Taliban attack with no casualties, he said.
Two US service members were killed in August last year when an Afghan soldier opened fire in southern Helmand province.