Quetta: Gunmen killed a Nato truck driver and burnt seven tankers carrying oil for Western troops in Afghanistan, the second such attack in southwest Pakistan in less than a week, police said on Monday.

The convoy was attacked while returning to the port city Karachi from the Afghan border, which Pakistan shut to Nato supplies on November 26 after Nato air strikes killed 24 Pakistani soldiers.

The gunmen attacked in the town of Dadar in Bolan district, southwest of Quetta, the provincial capital of Baluchistan, police said.

"Around eight gunmen approached the convoy on motorcycles in Bolan district, ordered it to stop and started firing on the tankers," senior local police official Inayat Bugti told AFP. "A driver of one of the tankers was also hit by a bullet and was killed instantly. The attackers later put the tankers on fire and escaped," he said.

No group has so far claimed responsibility for the attack but the Taliban have in the past said they carried out such attacks to disrupt supplies for the 140,000 US-led international troops fighting in Afghanistan.