Afghan and foreign troops thwarted a Taliban ambush at a checkpoint in southern Afghanistan and killed 13 suspected militants, a local official said Monday. Troops battled the militants for over two hours on Sunday in Zabul's Shahjoy district after they tried to attack the checkpoint on the main road linking Kabul to the southern city of Kandahar, said Ali Kheil, the spokesman for Zabul's governor. NATO and the US-led coalition did not immediately confirm the clash. Kheil said authorities recovered 13 bodies, along with nine AK-47 assault rifles, rocket-propelled grenades and two heavy machine guns. No Afghan or foreign troops were hurt, he said.