Gunmen attacked two Nato tankers on the highway between Chaman and Quetta near the Afghan border on Thursday, killing a Pakistani driver and injuring another, local police said.
On Tuesday, militants attacked a Nato tanker in the Dasht area of Quetta, killing two people.
Nato trucks and tankers are regularly targeted with arson attacks blamed on insurgents attempting to disrupt supply to foreign troops in Afghanistan.
Last month, The Express Tribune reported that Pakistani officials had blamed Nato for rejecting a security plan that Islamabad had unveiled to Western states last year to curb the growing number of attacks on the supply tankers.
The plan was unveiled to Nato officials in a meeting in Islamabad last year where Balochistan government officials were also present. British diplomats agreed to the plan but Nato officials rejected it without citing any reason.
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