The blast took place near Sultan Ibrahim Chowk area of Khuzdar district of the province, killing a station house officer of the Counter-Terrorism Department (CTD) on the spot, senior superintendent of local police Mir Hussain Ahmed Lehri told Xinhua.
He said that the officer was the target of the blast, adding that a magnetic bomb was fitted under the officer's vehicle by unknown miscreants.
Rescue teams, police and security forces immediately reached the site following the blast and shifted the injured to a nearby hospital.
The area was cordoned off, and a search operation was underway to arrest the culprits.
(With UNI inputs)