Press TV reports.
The accident took place in the Bolan district of Pakistan’s troubled Balochistan Province late on Monday when the assailants opened fire on the tankers and set them on fire.
One of the drivers was wounded in the attack, according to security officials.
The US-led NATO oil tankers were on their way from Karachi to Afghanistan when they were targeted.
Security forces cordoned off the area and took the injured driver to a nearby hospital.
Pakistan had been the main supply route for US-led forces occupying Afghanistan since 2001.
Militants have destroyed hundreds of NATO oil tankers and containers in different parts of Pakistan during the recent years.
Unknown assailants in southwestern Pakistan have torched two tankers carrying fuel to US-led NATO forces in neighboring Afghanistan,