The blast tookplace on Friday evening, Xinhua news agency reported.
Deputy Commissioner of Mastung district Sultan Bugti told the media that a roadside bomb blast hit a vehicle of a local tribal elder in the Qabu area of the district.
The vehicle was attacked when it was shifting the body of a person who was shot dead by unknown gunmen earlier on Friday.
Security forces and rescue teams rushed to the site, and brought the bodies and injured to a hospital.
The official added that the bomb was planted on the roadside and was detonated by a remote-controlled device.
No group or individual has claimed the attack yet.
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