No one was hurt in the early morning attack, but 25 of 27 trucks were damaged, officials said.
The attack took place in the Shikarpur district when four militants used fire crackers and petrol bombs to damage the trucks, said Muhammad Hanif, a senior police official in the district.
The trucks carry crude, diesel and petrol for NATO troops in Afghanistan.
Meanwhile, NATO convoys were still barred Friday from going into Afghanistan through the Torkham Gate checkpoint.
The supply route to Afghanistan has been closed by the Pakistani government after fighting that led to the deaths of three Pakistani soldiers, and a military spokesman said Thursday that United States is hopeful the situation is only temporary.
CNN
