The incident took place near the town of Wadh, some 380 kilometres (235 miles) south of Quetta, the capital of the restive oil- and gas-rich Baluchistan province which borders Iran and Afghanistan.
"Unknown gunmen fired at three NATO trucks, one of them overturned and the two other trucks were set ablaze by the attackers," local police official Juma Khan told AFP.
"There were no injuries to drivers," he said.
Another police official confirmed the attack.
NATO trucks and oil tankers are regularly targeted with arson attacks blamed on insurgents attempting to disrupt two key supply lines that cross western Pakistan bound for foreign troops fighting in neighbouring Afghanistan.
Most supplies and equipment required by foreign troops in Afghanistan are shipped through Pakistan, although US troops increasingly use alternative routes through central Asia.
Baluchistan is torn by Islamist militancy, sectarian violence between majority Sunnis and minority Shiite Muslims, and a separatist insurgency by rebels seeking political autonomy and a greater share of profits from natural resources. (M014/K004)
Editor: Kunto Wibisono
Copyright © ANTARA 2011
