Taliban insurgents attacked two checkpoints in eastern Afghanistan, killing four police officers in the latest test of Afghan forces' abilities as their NATO mentors withdraw. Mohammad Zahir Bahand, spokesman for Nuristan province, said Sunday that the fighting in Kamdesh district began overnight with attacks on checkpoints manned by national police and border police. The firefight, which left 13 militants dead, lasted hours and ended after reinforcements from the provincial capital, Paron. According to AP, he said four police were also wounded. Insurgents have been attacking government installations around the country.