QUETTA: Armed militants torched two tankers carrying fuel for US and Nato troops in Balochistan's insurgency-hit Bolan district on Sunday evening, officials said.

Muhammad Ayub, a levies official said four militants on two motorcycles opened fire at tankers in Haji Shehar area of Bolan district.

"The tankers caught fire after indiscriminate firing by the militants," he said.

Ayub said two drivers of the tankers sustained bullet-wounds and were shifted to hospital for medical treatment.

The militants fled on their motorcycles after the incident. A fire brigade was called in to put out the flames. Levies reached the area and cordoned off the area as an investigation into the incident is now being carried out.

There has been no claim of responsibility for the attack.

Militants have been targeting Nato supplies in Balochistan's Khuzdar, Kalat, Mastung, Quetta, Bolan and other areas for last more than six years.

The incident has come a day after the Chief Minister Balochistan Dr Malik Baloch announced on a DawnNews program that his government was committed to provide security to Nato and US supplies passing through the province.