NEW : Because Afghanistan is landlocked , many supplies for NATO-led troops fighting Islamic militants there have to be trucked in from Pakistan . NATO force expects no impact on ability to carry out operations . Pakistan suspends convoys into Afghanistan through key mountain passes . Route was used to deliver food and military supplies to U.S. troops . Militants attacked U.S. humvees , food aid in Afghanistan earlier this day .
NEW : NATO force expects no impact on ability to carry out operations . Pakistan suspends convoys into Afghanistan through key mountain passes . Route was used to deliver food and military supplies to U.S. troops . Militants attacked U.S. humvees , food aid in Afghanistan earlier this day .