The fireball engulfed the car of tribal elder Reham Dil in Quar town in Balochistan province, local police official Abdul Salam said.

"Reham Dil, his son, three guards and one servant died in the blast," he said.

A local administration official confirmed the casualties, saying that the blast set the car alight and two of the bodies were charred.

Officials said the target was the tribal elder but it was not immediately clear if the attack was result of some tribal vendetta or militant violence.