Gunmen in Pakistan attacked two trucks hauling containers with supplies for NATO forces in Afghanistan on Tuesday, police said.
The incident occurred in the area of Dasht Bado, a town in the district of Kalat of Pakistan's southwestern province of Balochistan, which borders Afghanistan.
It is the latest example of strikes against Afghan-bound shippers carrying supplies to help fight the Taliban.
Shair Ali, a police official of Kalat district of Balochistan province, said the gunmen stopped the vehicles, forced the drivers and their aides to run away, and threw petrol bombs at the vehicles, which caught fire and were damaged.
The containers were going to Afghanistan from Karachi through the Chaman border crossing.