Pakistani officials say gunmen on motorcycles shot dead four police officers in the southwestern province of Balochistan.
The shootings took place on June 11 in the Pashtunabad neighborhood of the provincial capital, Quetta, as the police were conducting a patrol in their vehicle.
No group immediately claimed responsibility for the attack.
Balochistan has been the scene of violence perpetrated by Islamic radicals and Baluch separatists who want a share of revenue from natural gas and mineral resources and complete autonomy from Islamabad.
On May 29, gunmen killed at least 19 people traveling in a bus in the town of Mastung, some 40 kilometers south of Quetta.