Gunmen opened fire on an Afghanistan-bound convoy of NATO fuel supply trucks in the Shikarpur area of southern Sindh province, and set fire to six of them, police officials said.
According to the media reports, the gunmen, who were riding motorcycles, first opened fire on the NATO oil tankers and then set them ablaze.
Police arrived at the scene and searched the area to apprehend the attackers, but no one was arrested.
The oil tankers were coming from the port city of Karachi and heading to Afghanistan.
