PESHAWAR, Pakistan - A Pakistani decision to temporarily bar some trucks from a key passageway to Afghanistan threatened a critical supply route for U.S. and NATO troops on Sunday and raised more fears about deteriorating security in the militant-plagued border region.

The suspension of oil tankers and trucks carrying sealed containers came as U.S.-led coalition troops in eastern Afghanistan reported killing five al-Qaida-linked fighters and detaining eight others, including a militant leader.