Superintendent of Police of Quaidabad area, Mubarak Shah, was targetted by the gunmen in Quetta, the provincial capital, while he was patrolling in the area with his team.
Inspector General of Police in Balochistan Abdul Razzak Cheema confirmed the attack on Shah.
"Shah was injured and later died in the hospital while three police personnel died on the spot," he said.
Another policeman was injured and was being treated.
No group has claimed responsibility for the attack.
Taliban militants often carry out such attacks in the area.
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